diff --git a/libcontainer/README.md b/libcontainer/README.md
index 78e78e63..61496946 100644
--- a/libcontainer/README.md
+++ b/libcontainer/README.md
@@ -216,6 +216,9 @@ container.Pause()
 
 // resume all paused processes.
 container.Resume()
+
+// send signal to container's init process.
+container.Signal(signal)
 ```