diff --git a/classes/output/comment.php b/classes/output/comment.php
index 6066cc8aec2170988a91a3c89864e7f2daf1495d..26bb275673e28db94c18973d24543dc8361b0dd8 100644
--- a/classes/output/comment.php
+++ b/classes/output/comment.php
@@ -27,6 +27,7 @@ defined('MOODLE_INTERNAL') || die();
 class comment implements \renderable, \templatable {
 
     private $comments = [];
+    private $questionvisibility;
 
     /**
      * Constructor of renderable for comments.
@@ -55,6 +56,7 @@ class comment implements \renderable, \templatable {
         $forwardquestions = has_capability('mod/pdfannotator:forwardquestions', $context);
         $solve = has_capability('mod/pdfannotator:markcorrectanswer', $context);
 
+        $this->questionvisibility = $data[0]->visibility;
         foreach ($data as $comment) {
 
             $comment->buttons = [];
@@ -193,7 +195,7 @@ class comment implements \renderable, \templatable {
     private function addcloseopenbutton($comment, $closequestion, $closeanyquestion) {
 
         if (!isset($comment->type) && $comment->isquestion // Only set for textbox and drawing.
-                && (($comment->owner && $closequestion) || $closeanyquestion)) {
+                && (($comment->owner && $closequestion) || $closeanyquestion)  && $comment->visibility != 'private') {
 
             if ($comment->solved) {
                 $comment->buttons[] = ["classes" => "comment-solve-a", "faicon" => ["class" => "fa-unlock"],
@@ -220,6 +222,10 @@ class comment implements \renderable, \templatable {
     }
 
     private function addhidebutton($comment, $seehiddencomments, $hidecomments) {
+        // Don't need to hide personal notes.
+        if ($this->questionvisibility == 'private') {
+            return;
+        }
         if (!empty($comment->ishidden) && !isset($comment->type)) {
             if ($seehiddencomments) {
                 $comment->content = $comment->content;
@@ -256,7 +262,7 @@ class comment implements \renderable, \templatable {
     }
 
     private function addsubscribebutton($comment, $subscribe) {
-        if (!isset($comment->type) && $comment->isquestion && $subscribe) { // Only set for textbox and drawing.
+        if (!isset($comment->type) && $comment->isquestion && $subscribe && $comment->visibility != 'private') { // Only set for textbox and drawing.
             if (!empty($comment->issubscribed)) {
                 $comment->buttons[] = ["classes" => "comment-subscribe-a", "faicon" => ["class" => "fa-bell-slash"],
                     "text" => get_string('unsubscribeQuestion', 'pdfannotator')];
@@ -268,7 +274,7 @@ class comment implements \renderable, \templatable {
     }
 
     private function addforwardbutton($comment, $forwardquestions, $cm) {
-        if (!isset($comment->type) && $comment->isquestion && !$comment->isdeleted && $forwardquestions) {
+        if (!isset($comment->type) && $comment->isquestion && !$comment->isdeleted && $forwardquestions  && $comment->visibility != 'private') {
             global $CFG;
             $urlparams = ['id' => $cm->id, 'action' => 'forwardquestion', 'commentid' => $comment->uuid, 'sesskey' => sesskey()];
             $url = new moodle_url($CFG->wwwroot . '/mod/pdfannotator/view.php', $urlparams);
@@ -279,7 +285,7 @@ class comment implements \renderable, \templatable {
     }
 
     private function addmarksolvedbutton($comment, $solve) {
-        if ($solve && !$comment->isquestion && !$comment->isdeleted && !isset($comment->type)) {
+        if ($solve && !$comment->isquestion && !$comment->isdeleted && !isset($comment->type) && $this->questionvisibility != 'private') {
             if ($comment->solved) {
                 $comment->buttons[] = ["classes" => "comment-solve-a", "text" => get_string('removeCorrect', 'pdfannotator'),
                     "moodleicon" => ["key" => "i/completion-manual-n", "component" => "core", "title" => get_string('removeCorrect', 'pdfannotator')]];
diff --git a/classes/output/index.php b/classes/output/index.php
index 4b0c276ec0aecb747be5023c3194c1ada57058ee..fc391ca0c111a32294f6acb247813dffdde203c9 100644
--- a/classes/output/index.php
+++ b/classes/output/index.php
@@ -77,6 +77,9 @@ class index implements renderable, templatable { // Class should be placed elsew
         if ($data->useprotectedcomments) {
             $data->protectedhelpicon = $OUTPUT->help_icon('protected_comments', 'mod_pdfannotator');
         }
+        if ($data->useprivatecomments) {
+            $data->privatehelpicon = $OUTPUT->help_icon('private_comments', 'mod_pdfannotator');
+        }
         $data->printlink = $this->printurl;
         $data->pixprintdoc = $OUTPUT->image_url('download', 'mod_pdfannotator');
         $data->pixprintcomments = $OUTPUT->image_url('print_comments', 'mod_pdfannotator');
diff --git a/lang/en/pdfannotator.php b/lang/en/pdfannotator.php
index b9b693277fe9d4869aca6d9be823180055dba9fd..7f796c2cccb9429bae2683c254cb64eb5c598be5 100644
--- a/lang/en/pdfannotator.php
+++ b/lang/en/pdfannotator.php
@@ -61,7 +61,6 @@ $string['colorPicker'] = 'Pick a color';
 $string['comment'] = 'Comment';
 $string['commentDeleted'] = 'Comment has been deleted';
 $string['comments'] = 'Comments';
-$string['continueDiscussion'] = 'Add a comment';
 $string['correct'] = 'correct';
 $string['count'] = 'count';
 $string['createAnnotation'] = 'Create Annotation';
@@ -333,9 +332,10 @@ $string['privacy:metadata:pdfannotator_votes:commentid'] = "The ID of the commen
 $string['privacy:metadata:pdfannotator_votes:userid'] = "The ID of the user who marked the comment as interesting or helpful. It is saved in order to prevent users from voting for the same comment repeatedly.";
 $string['privacy:metadata:pdfannotator_votes'] = "Information about questions and comments that were marked as interesting or helpful.";
 $string['private_comments'] = "Personal notes";
+$string['private_comments_help'] = 'Visible only for you.';
 $string['protected_answers'] = 'Private answers';
 $string['protected_comments'] = "Private comments";
-$string['protected_comments_help'] = 'Visible only for you and managers.';
+$string['protected_comments_help'] = 'Visible only for you and teachers.';
 $string['protected_questions'] = 'Private questions';
 $string['public_comments'] = 'Public comments';
 $string['question'] = 'Question';
@@ -401,7 +401,7 @@ $string['setting_useprint_help'] = "Please note that drawings are not anonymous
 $string['setting_use_private_comments'] = "Allow personal notes";
 $string['setting_use_private_comments_help'] = "Allow participants to write personal notes. Other person cannot see this comment.";
 $string['setting_use_protected_comments'] = "Allow private comments";
-$string['setting_use_protected_comments_help'] = "Allow participants to write private comments. Only author and manager can see this comment.";
+$string['setting_use_protected_comments_help'] = "Allow participants to write private comments. Only the author and teachers can see this comment.";
 $string['setting_usevotes'] = "Votes/Likes";
 $string['setting_usevotes_help'] = "With this option enabled, users can like / vote for posts other than their own.";
 $string['show'] = 'Show';
diff --git a/model/comment.class.php b/model/comment.class.php
index a24eb4d336cceb105be232fe6cdd8727fce3318f..df8b26c4aa8e6c3b9c93153137ce2ea27b4ef781 100644
--- a/model/comment.class.php
+++ b/model/comment.class.php
@@ -192,7 +192,6 @@ class pdfannotator_comment {
             }
 
             if ($data->isdeleted) {
-                $comment->visibility = 'deleted';
                 $comment->content = get_string('deletedComment', 'pdfannotator');
             } else {
                 $comment->content = $data->content;
diff --git a/model/statistics.class.php b/model/statistics.class.php
index be58107b8a056d96382da1cc0f221bf49fbfd195..c77dc47c073f0cabcd186704762feecf37ce7169 100644
--- a/model/statistics.class.php
+++ b/model/statistics.class.php
@@ -194,11 +194,11 @@ class pdfannotator_statistics {
             $myprivate[] = $countmyprivateanswers + $countmyprivatequestions;
 
             $myquestions[] = $countmyquestions - $countmyprotectedquestions - $countmyprivatequestions;
-            $otherquestions[] = $countquestions - $myquestions[$index] - $countprotectedanswers - $countprivatequestions;     
+            $otherquestions[] = $countquestions - $myquestions[$index] - $countprotectedquestions - $countprivatequestions;     
 
             $myanswers[] = $countmyanswers - $countmyprotectedanswers - $countmyprivateanswers;
-            $otheranswers[] = $countanswers - $myanswers[$index] - $countprotectedanswers - $countprivateanswers;            
-
+            $otheranswers[] = $countanswers - $myanswers[$index] - $countprotectedanswers - $countprivateanswers;
+            
             $names[] = $pdfannotator->get_name();
 
         }
@@ -207,7 +207,7 @@ class pdfannotator_statistics {
     }
 
     /**
-     * Returns the number of questions/answers in one PDF-Annotator by one/all users
+     * Returns the number of all questions/answers in one PDF-Annotator by one/all users
      * @global type $DB
      * @param type $annotatorid
      * @param type $isquestion '1' for questions, '0' for answers
diff --git a/shared/index.js b/shared/index.js
index b44bc2cbe37a569a88f119c459492b3eb8024e63..37b28ef285aa6562c40b84b7c590e3440803e6cd 100644
--- a/shared/index.js
+++ b/shared/index.js
@@ -1913,6 +1913,7 @@ function startIndex(Y,_cm,_documentObject,_userid,_capabilities, _toolbarSetting
                     $("#privateDiv").hide();
                     $("#protectedDiv").hide();
                     $("#anonymousDiv").show();
+                    $("#myarea").attr("placeholder", M.util.get_string('addAComment', 'pdfannotator'));
                   }
                   
                   $('#comment-wrapper h4')[0].innerHTML = title;
diff --git a/shared/statistic.js b/shared/statistic.js
index c561eb85c47d064a97c7406868951b8e800d538f..c2c757c629e31cb0dcbc647be691a68bc86dda06 100644
--- a/shared/statistic.js
+++ b/shared/statistic.js
@@ -17,6 +17,7 @@ function setCharts(Y, names, otherquestions, myquestions, otheranswers, myanswer
 
         var maxValue = calculateMax(otherquestions, myquestions, otheranswers, myanswers, otherprivate, myprivate, otherprotectedquestions, myprotectedquestions, otherprotectedanswers, myprotectedanswers);
 
+        var borderCol = 'rgb(250, 245, 235)';
         var ctx = document.getElementById('myChart').getContext('2d');
         var myChart = new Chart(ctx, {
             type: 'bar',
@@ -27,56 +28,80 @@ function setCharts(Y, names, otherquestions, myquestions, otheranswers, myanswer
                         stack: 'questions',
                         data: myquestions,
                         backgroundColor: 'rgb(0,84,159)',
+                        borderColor: borderCol,
+                        borderWidth: 1,
                     }, {
                         label: M.util.get_string('questions', 'pdfannotator') + ' ' + M.util.get_string('by_other_users', 'pdfannotator'),
                         stack: 'questions',
                         data: otherquestions,
                         backgroundColor: 'rgb(142,186,229)',
+                        borderColor: borderCol,
+                        borderWidth: 1,
                     }, {
                         label: M.util.get_string('myprotectedquestions', 'pdfannotator'),
                         stack: 'questions',
                         data: myprotectedquestions,
-                        backgroundColor: 'rgb(137, 204, 207)',
+                        backgroundColor: 'rgb(0, 152, 161)',
+                        borderColor: borderCol,
+                        borderWidth: 1,
                     }, {
                         label: M.util.get_string('protected_questions', 'pdfannotator') + ' ' + M.util.get_string('by_other_users', 'pdfannotator'),
                         stack: 'questions',
                         data: otherprotectedquestions,
-                        backgroundColor: 'rgb(0, 152, 161)',
+                        backgroundColor: 'rgb(137, 204, 207)',
+                        borderColor: borderCol,
+                        borderWidth: 1,
                     },
                     {
                         label: M.util.get_string('myanswers', 'pdfannotator'),
                         stack: 'answers',
                         data: myanswers,
                         backgroundColor: 'rgb(87, 171, 39)',
+                        borderColor: 'rgb(0, 0, 0)',
+                        borderWidth: 1,
+                        borderColor: borderCol,
+                        borderWidth: 1,
                     }, 
                     {
                         label: M.util.get_string('answers', 'pdfannotator') + ' ' + M.util.get_string('by_other_users', 'pdfannotator'),
                         stack: 'answers',
                         data: otheranswers,
                         backgroundColor: 'rgb(184, 214, 152)',
+                        borderColor: 'rgb(0, 0, 0)',
+                        borderWidth: 1,
+                        borderColor: borderCol,
+                        borderWidth: 1,
                     }, 
                     {
                         label: M.util.get_string('myprotectedanswers', 'pdfannotator'),
                         stack: 'answers',
                         data: myprotectedanswers,
-                        backgroundColor: 'rgb(224, 230, 154)',
+                        backgroundColor: 'rgb(189, 205, 0)',
+                        borderColor: borderCol,
+                        borderWidth: 1,
                     }, {
                         label: M.util.get_string('protected_answers', 'pdfannotator') + ' ' + M.util.get_string('by_other_users', 'pdfannotator'),
                         stack: 'answers',
                         data: otherprotectedanswers,
-                        backgroundColor: 'rgb(189, 205, 0)',
+                        backgroundColor: 'rgb(224, 230, 154)',
+                        borderColor: borderCol,
+                        borderWidth: 1,
                     },
                     {
                         label: M.util.get_string('myprivate', 'pdfannotator'),
                         stack: 'private',
                         data: myprivate,
                         backgroundColor: 'rgb(246, 168, 0)',
+                        borderColor: borderCol,
+                        borderWidth: 1,
                     },
                     {
                         label: M.util.get_string('private_comments', 'pdfannotator') + ' ' + M.util.get_string('by_other_users', 'pdfannotator'),
                         stack: 'private',
                         data: otherprivate,
                         backgroundColor: 'rgb(253, 212, 143)',
+                        borderColor: borderCol,
+                        borderWidth: 1,
                     }]
             },
             options: {
@@ -91,9 +116,11 @@ function setCharts(Y, names, otherquestions, myquestions, otheranswers, myanswer
                     position: 'bottom'
                 },
                 scales: {
-
                     xAxes: [{
-                            stacked: true
+                            stacked: true,
+                            ticks: {
+                                autoSkip: false
+                            }
                         }],
                     yAxes: [{
                             ticks: {
diff --git a/styles.css b/styles.css
index c47122067bd9d26071dfc84d2c87d13c1399f09c..482396d52229abb6a7bda7f417b0fc6c1e72a657 100644
--- a/styles.css
+++ b/styles.css
@@ -527,8 +527,13 @@ body {
     margin-bottom: 0;
 }
 
-.path-mod-pdfannotator #anonymousDiv, .path-mod-pdfannotator #privateDiv, .path-mod-pdfannotator #protectedDiv {
+.path-mod-pdfannotator #comment-list-form > div {
     margin: 5px 0px;
+    display: block;
+}
+
+.path-mod-pdfannotator #comment-list-form > div > * {
+    vertical-align: middle;
 }
 
 .path-mod-pdfannotator .helperLayer {
diff --git a/templates/index.mustache b/templates/index.mustache
index 13190d46adea4bf4f9d3e7f30d92c0346e88349a..3f6117a8c68fee2b0f837f495b498b79a83efa0d 100644
--- a/templates/index.mustache
+++ b/templates/index.mustache
@@ -137,12 +137,14 @@
                     </div>
                     {{# useprivatecomments }}
                     <div id="privateDiv" class="row-fluid row">
-                        <input type="checkbox" name="visibility" value="private" id="privateCheckbox" class="pdfannotator-radio" style="width:auto;"><label id="privateLabel" for="privateCheckbox">{{# str }} sendPrivate, pdfannotator {{/ str }}</label>
+                        <input type="checkbox" name="visibility" value="private" id="privateCheckbox" class="pdfannotator-radio" style="width:auto;">
+                        <label id="privateLabel" for="privateCheckbox">{{# str }} sendPrivate, pdfannotator {{/ str }}</label> {{{privatehelpicon}}}
                     </div>
                     {{/ useprivatecomments }}
                     {{# useprotectedcomments }}
                     <div id="protectedDiv" class="row-fluid row">
-                        <input type="checkbox" name="visibility" value="protected" id="protectedCheckbox" class="pdfannotator-radio" style="width:auto;"><label id="protectedLabel" for="protectedCheckbox">{{# str }} sendProtected, pdfannotator {{/ str }} {{{protectedhelpicon}}} </label>
+                        <input type="checkbox" name="visibility" value="protected" id="protectedCheckbox" class="pdfannotator-radio" style="width:auto;">
+                        <label id="protectedLabel" for="protectedCheckbox">{{# str }} sendProtected, pdfannotator {{/ str }} </label> {{{protectedhelpicon}}}
                     </div>
                     {{/ useprotectedcomments }}