diff --git a/doc/en/Authoring/Inputs/index.md b/doc/en/Authoring/Inputs/index.md
index 67f81ccd13dc0106b1dde528c4be594ca36680d7..f8051cb1ae437989b632793b2786c6801e813236 100644
--- a/doc/en/Authoring/Inputs/index.md
+++ b/doc/en/Authoring/Inputs/index.md
@@ -61,7 +61,7 @@ Currently STACK supports the following kinds of inputs.  These have a variety of
 Some of the special blocks provide interactions which can be linked to inputs.  These include
 
 1. **JSXGraph** diagrams.
-2, **GeoGebra** diagrams.
+2. **GeoGebra** diagrams.
 3. **Drag and drop** problems.
 
 #### True/False inputs ####
diff --git a/doc/en/Authoring/Potential_response_trees.md b/doc/en/Authoring/Potential_response_trees.md
index e13431fe2a4e68df971cb4a91023d37ff5133a36..757c6e3df2b5d366003166145922db27cf377b88 100644
--- a/doc/en/Authoring/Potential_response_trees.md
+++ b/doc/en/Authoring/Potential_response_trees.md
@@ -84,7 +84,7 @@ The outcomes of score, penalty, feedback and note are always produced.  Normally
 
 There are rare, but important, situations where we need a purely formative PRT.
 
-E.g. Imagine a questions with inputs A, and B.
+E.g. Imagine a question with inputs A and B.
 
 1. Input A has a dedicated PRT to establish if it is correct.
 2. Input B has a dedicated PRT to establish if it is correct.
diff --git a/doc/en/Authoring/Variables.md b/doc/en/Authoring/Variables.md
index 40056cbf7fd2db25e3155c9d2439cfbdaa85a9aa..653b5365bca01741a40beb123dd69e054b8113e7 100644
--- a/doc/en/Authoring/Variables.md
+++ b/doc/en/Authoring/Variables.md
@@ -58,7 +58,7 @@ If the following commands appear within the question variables they will be avai
 
 This collection of special variables are called "context variables".
 
-STACK has a special constant `%_stack_preamble_end`.  Any variables _before_ this constant will be included within the context variables.  This enables you to define functions, e.g. to use with `textput`.  
+STACK has a special constant `%_stack_preamble_end`.  Any variables _before_ this constant will be included within the context variables.  This enables you to define functions, e.g. to use with `texput`.  
 
 Note, that students are not permitted to use any variable name defined by the teacher in the question variables.  This includes both the context variables, and the regular remaining question variables.  It is not possible to define variables which a student can then use.  Students _can_ use function names defined in the preamble. e.g. you can put `vec(ex):=stackvector(ex);` into the preamble.