diff --git a/after/syntax/c.vim b/after/syntax/c.vim
index fcbac32..5996c7a 100644
--- a/after/syntax/c.vim
+++ b/after/syntax/c.vim
@@ -43,9 +43,9 @@ if exists('g:c_doxygen') && g:c_doxygen
   " Match: comment leader
   syn match cDoxygenLeader '^\s*\/\/\/' contained display
 
-  " Match: @param name description.
-  "               ^^^^
-  syn region cDoxygenSpecial matchgroup=cDoxygenComment start='@param\(\[\(\|in\|out\|in,out\)\]\)\=\s\+' end='\(\s\|$\)' contained display
+  " Match: @param name description.   @retval name description.
+  "               ^^^^                        ^^^^
+  syn region cDoxygenSpecial matchgroup=cDoxygenComment start='@\(param\(\[\(\|in\|out\|in,out\)\]\)\|retval\)\=\s\+' end='\(\s\|$\)' contained display
 
   " Match: @tparam name description.
   "                ^^^^