diff --git a/modules/launchd/launchd.nix b/modules/launchd/launchd.nix
index a212efd3..ee202944 100644
--- a/modules/launchd/launchd.nix
+++ b/modules/launchd/launchd.nix
@@ -259,6 +259,10 @@ in
               AfterInitialDemand = mkOption {
                 type = types.nullOr types.bool;
                 default = null;
+                description = ''
+                  Whether to defer evaluating other `KeepAlive` conditions until
+                  the job has been started at least once by demand.
+                '';
               };
 
             };