diff --git a/UltiSnips/c.snippets b/UltiSnips/c.snippets
index 3ee3fa4..56f34e5 100644
--- a/UltiSnips/c.snippets
+++ b/UltiSnips/c.snippets
@@ -11,7 +11,7 @@ endsnippet
 snippet ifndef "#ifndef ... #define ... #endif"
 #ifndef ${1/([A-Za-z0-9_]+).*/$1/}
 #define ${1:SYMBOL} ${2:value}
-#endif
+#endif /* ifndef $1 */
 endsnippet
 
 snippet #if "#if #endif" b
diff --git a/snippets/c.snippets b/snippets/c.snippets
index 6a1cbaa..f4745c2 100644
--- a/snippets/c.snippets
+++ b/snippets/c.snippets
@@ -25,7 +25,7 @@ snippet Inc
 snippet ndef
 	#ifndef $1
 	#define ${1:SYMBOL} ${2:value}
-	#endif
+	#endif /* ifndef $1 */
 # define
 snippet def
 	#define