diff --git a/src/cfgparse.c b/src/cfgparse.c
index dcea0f2..a27ef98 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -3958,7 +3958,7 @@
 			newsrv->id = strdup(args[1]);
 
 			/* several ways to check the port component :
-			 *  - IP    => port=+0, relative
+			 *  - IP    => port=+0, relative (IPv4 only)
 			 *  - IP:   => port=+0, relative
 			 *  - IP:N  => port=N, absolute
 			 *  - IP:+N => port=+N, relative