diff --git a/libstdc++-v3/config.h.in b/libstdc++-v3/config.h.in
index c0aa51af3f0..17da7bb9867 100644
--- a/libstdc++-v3/config.h.in
+++ b/libstdc++-v3/config.h.in
@@ -167,7 +167,7 @@
 /* Define to 1 if you have the `hypotl' function. */
 #undef HAVE_HYPOTL
 
-/* Define if you have the iconv() function. */
+/* Define if you have the iconv() function and it works. */
 #undef HAVE_ICONV
 
 /* Define to 1 if you have the <ieeefp.h> header file. */