diff --git a/README.md b/README.md
index 2713cbb3e8a432f9edf1d636e0ace0e91bff972e..28d8e3457c5a520ce6ff7824afa5e77da8e18fbf 100644
--- a/README.md
+++ b/README.md
@@ -298,6 +298,7 @@ To perform a restart after an API change use the following command:
     * 'ERROR'
     * 'DISABLED'
   * `reg_auth=https://reg.auth.example.org` (select a specific Registration Authority)
+  * `format=simple` (retrieve results in a simple format)
 * `/api/fedstats`
 * `/api/fedstats?reg_auth=https://reg.auth.example.org`: