diff --git a/sys/sys/socket.h b/sys/sys/socket.h
index 0de965f6b4d..5fa906c9378 100644
--- a/sys/sys/socket.h
+++ b/sys/sys/socket.h
@@ -483,8 +483,8 @@ struct cmsghdr {
 #if __BSD_VISIBLE
 /*
  * While we may have more groups than this, the cmsgcred struct must
- * be able to fit in an mbuf, and NGROUPS_MAX is too large to allow
- * this.
+ * be able to fit in an mbuf and we have historically supported a
+ * maximum of 16 groups.
 */
 #define CMGROUP_MAX 16