diff --git a/doc/appendix-2.md b/doc/appendix-2.md
index 478490d..1b080dd 100755
--- a/doc/appendix-2.md
+++ b/doc/appendix-2.md
@@ -68,7 +68,9 @@ Other test projects are recognised by applying a regular expression to the full
 
 Figure – MSBuild settings tab of the C# plugin
 
-The regular expression uses [.Net regular expression syntax](https://msdn.microsoft.com/en-us/library/az24scfc(v=vs.110).aspx).
+The regular expression uses [.Net regular expression syntax][1].
+
+[1]: https://msdn.microsoft.com/en-us/library/az24scfc(v=vs.110).aspx
 
 In version 1.0.1 onwards, the default regular expression treats projects that contain the word "test" in the project file name as test projects (in version 1.0, projects that contained "test" anywhere in the path were treated as test projects, but user feedback indicated that this regular expression was not specific enough and incorrectly classified to many projects).