Comments.
diff --git a/ssl/ssl_cert.c b/ssl/ssl_cert.c
index b33658f..6d2511f 100644
--- a/ssl/ssl_cert.c
+++ b/ssl/ssl_cert.c
@@ -426,7 +426,7 @@
 		(char *)s);
 
 	if (s->ctx->app_verify_callback != NULL)
-		i=s->ctx->app_verify_callback(&ctx);
+		i=s->ctx->app_verify_callback(&ctx); /* should pass app_verify_arg */
 	else
 		{
 #ifndef NO_X509_VERIFY