diff --git a/doc/sample.config b/doc/sample.config
index 355daf50..c7330b3a 100644
--- a/doc/sample.config
+++ b/doc/sample.config
@@ -294,7 +294,8 @@ deny-roaming = false
 
 # ReKey time (in seconds)
 # ocserv will ask the client to refresh keys periodically once
-# this amount of seconds is elapsed. Set to zero to disable.
+# this amount of seconds is elapsed. Set to zero to disable (note
+# that, some clients fail if rekey is disabled).
 rekey-time = 172800
 
 # ReKey method
diff --git a/src/ocserv-args.def b/src/ocserv-args.def
index b2ffa352..98343932 100644
--- a/src/ocserv-args.def
+++ b/src/ocserv-args.def
@@ -375,7 +375,8 @@ deny-roaming = false
 
 # ReKey time (in seconds)
 # ocserv will ask the client to refresh keys periodically once
-# this amount of seconds is elapsed. Set to zero to disable.
+# this amount of seconds is elapsed. Set to zero to disable (note
+# that, some clients fail if rekey is disabled).
 rekey-time = 172800
 
 # ReKey method