diff --git a/res/res_pjsip_outbound_registration.c b/res/res_pjsip_outbound_registration.c
index da597a91c6..df50cf40fe 100644
--- a/res/res_pjsip_outbound_registration.c
+++ b/res/res_pjsip_outbound_registration.c
@@ -86,6 +86,11 @@
 				</configOption>
 				<configOption name="max_retries" default="10">
 					<synopsis>Maximum number of registration attempts.</synopsis>
+					<description><para>
+						This sets the maximum number of registration attempts that are made before
+						stopping any further attempts. If set to 0 then upon failure no further attempts
+						are made.
+					</para></description>
 				</configOption>
 				<configOption name="outbound_auth" default="">
 					<synopsis>Authentication object(s) to be used for outbound registrations.</synopsis>