diff --git a/api/identity/pubkey.yaml b/api/identity/pubkey.yaml
index 5ea6341fc..1cd7b94cd 100644
--- a/api/identity/pubkey.yaml
+++ b/api/identity/pubkey.yaml
@@ -56,7 +56,8 @@ paths:
     get:
       summary: Check whether a long-term public key is valid.
       description: |-
-        Check whether a long-term public key is valid. The request must be idempotent.
+        Check whether a long-term public key is valid. The response should always
+        be the same, provided the key exists.
       operationId: isPubKeyValid
       parameters:
         - in: query