diff --git a/doc/coding_style.dox b/doc/coding_style.dox
--- a/doc/coding_style.dox
+++ b/doc/coding_style.dox
@@ -98,10 +98,10 @@
 
 \subsection pri-loc-var Private member variables
 
-Private member variables should start with underscore
+Private member variables should start with underscore.
 
 \code
-_start_with_underscores
+_start_with_underscore
 \endcode
 
 \subsection cs-excep Exceptions