diff --git a/test/error_test.cc b/test/error_test.cc
--- a/test/error_test.cc
+++ b/test/error_test.cc
@@ -54,6 +54,7 @@
 }
 #undef LEMON_DISABLE_ASSERTS
 
+//checking custom assert handler
 #define LEMON_ASSERT_CUSTOM
 
 static int cnt = 0;