diff --git a/test/nopoll-regression-client.c b/test/nopoll-regression-client.c
index e08ef37..a9f6778 100644
--- a/test/nopoll-regression-client.c
+++ b/test/nopoll-regression-client.c
@@ -1800,6 +1800,7 @@ nopoll_bool test_20 (void) {
 }
 #endif
 
+/** http://stackoverflow.com/questions/4261369/openssl-verify-peer-client-certificate-in-c **/
 nopoll_bool test_21 (void) {
 
 	noPollCtx  * ctx;