diff --git a/api/swagger.yaml b/api/swagger.yaml
index 46505d06c0..8cb8c9cbd1 100644
--- a/api/swagger.yaml
+++ b/api/swagger.yaml
@@ -7038,9 +7038,14 @@ paths:
         - name: "condition"
           in: "query"
           description: |
-            Wait until a container state reaches the given condition, either
-            'not-running' (default), 'next-exit', or 'removed'.
+            Wait until a container state reaches the given condition.
+
+            Defaults to `not-running` if omitted or empty.
           type: "string"
+          enum:
+            - "not-running"
+            - "next-exit"
+            - "removed"
           default: "not-running"
       tags: ["Container"]
   /containers/{id}: