diff --git a/docs/signals.md b/docs/signals.md
index cbe74fc3fa..04f1fb673a 100644
--- a/docs/signals.md
+++ b/docs/signals.md
@@ -42,6 +42,8 @@ Puma cluster responds to these signals:
 - `INT ` equivalent of sending Ctrl-C to cluster. Puma will attempt to finish then exit.
 - `CHLD`
 - `URG ` refork workers in phases from worker 0 if `fork_workers` option is enabled.
+- `INFO ` print threak backtraces
+
 
 ## Callbacks order in case of different signals