diff --git a/doc/en/Developer/Documentation.md b/doc/en/Developer/Documentation.md
index 44f87eef3599fb9dbaf32474035ed950692c8c42..e5646c75cf9730551c8f7cabd1b9b227c2135447 100644
--- a/doc/en/Developer/Documentation.md
+++ b/doc/en/Developer/Documentation.md
@@ -7,7 +7,6 @@ for people wishing to write, edit and translate the documentation.
 ## Markdown language
 
 * The [markdown](http://daringfireball.net/projects/markdown/) project external site.
-* [A cheat sheet](http://scottboms.com/-/downloads/documentation/markdown_cheatsheet.pdf) is available for quick reference.
 
 **Warning:** markdown uses whitespace and formatting to give meaning.  The number of spaces at the beginning and the ends of lines convey specific meaning in markdown.  An example is the way code blocks are included, which is useful for including fragments of Maxima code.