diff --git a/API.md b/API.md
index 3181bc4bf..392910b0a 100644
--- a/API.md
+++ b/API.md
@@ -60,6 +60,12 @@ On success
 
 ### HassIO
 
+- `/supervisor/ping`
+```json
+{
+    "uptime": 0,
+ }
+
 - `/supervisor/info`
 
 ```json