diff --git a/api/swagger.yaml b/api/swagger.yaml
index ba5745801cc2e..5a6e7ff870789 100644
--- a/api/swagger.yaml
+++ b/api/swagger.yaml
@@ -4273,7 +4273,7 @@ definitions:
       Prune:
         type: "boolean"
         example: false
-        description: "Prune services that are no longer referenced"
+        description: "Prune services that are no longer referenced (only available for Swarm stacks)"
   StackFileInspectResponse:
     type: "object"
     properties: