diff --git a/doc/api/cluster.md b/doc/api/cluster.md
index 8036f82e797617..ddb02d761a6fb2 100644
--- a/doc/api/cluster.md
+++ b/doc/api/cluster.md
@@ -334,7 +334,7 @@ added: v6.0.0
 
 * {boolean}
 
-Set by calling `.kill()` or `.disconnect()`. Until then, it is `undefined`.
+Set by calling `.kill()` or `.disconnect()`. Until then, it is `false`.
 
 The boolean [`worker.exitedAfterDisconnect`][] allows distinguishing between
 voluntary and accidental exit, the master may choose not to respawn a worker