diff --git a/doc/api/assert.md b/doc/api/assert.md
index 9baccfeaa7f9..af33e5e28c8a 100644
--- a/doc/api/assert.md
+++ b/doc/api/assert.md
@@ -148,6 +148,13 @@ try {
 ```
 
 ## Class: `assert.CallTracker`
+<!-- YAML
+added: REPLACEME
+-->
+
+> Stability: 1 - Experimental
+
+This feature is currently experimental and behavior might still change.
 
 ### `new assert.CallTracker()`
 <!-- YAML