diff --git a/doc/api/cluster.md b/doc/api/cluster.md
index 979ddac5b9223d..06f730e3ae66a5 100644
--- a/doc/api/cluster.md
+++ b/doc/api/cluster.md
@@ -336,7 +336,9 @@ added: v6.0.0
 
 * {boolean}
 
-Set by calling `.kill()` or `.disconnect()`. Until then, it is `undefined`.
+This property is `true` if the worker exited due to `.kill()` or
+`.disconnect()`. If the worker exited any other way, it is `false`. If the
+worker has not exited, it is `undefined`.
 
 The boolean [`worker.exitedAfterDisconnect`][] allows distinguishing between
 voluntary and accidental exit, the master may choose not to respawn a worker