diff --git a/cpp/src/Slice/Grammar.y b/cpp/src/Slice/Grammar.y
index f778e43c03e..6ca192c62f0 100644
--- a/cpp/src/Slice/Grammar.y
+++ b/cpp/src/Slice/Grammar.y
@@ -86,7 +86,7 @@ int slice_lex(YYSTYPE* lvalp, YYLTYPE* llocp);
 #  pragma GCC diagnostic ignored "-Wunused-label"
 #endif
 
-// Avoid clang conversion warnings
+// Avoid clang warnings in generate grammar
 #if defined(__clang__)
 #   pragma clang diagnostic ignored "-Wconversion"
 #   pragma clang diagnostic ignored "-Wsign-conversion"