diff --git a/man/runc-kill.8.md b/man/runc-kill.8.md
index c18fe9442..5f0f51ed9 100644
--- a/man/runc-kill.8.md
+++ b/man/runc-kill.8.md
@@ -17,7 +17,12 @@ to list available signals.
 
 # OPTIONS
 **--all**|**-a**
-: Send the signal to all processes inside the container.
+: Send the signal to all processes inside the container, rather than
+the container's init only. This option is useful when the container does not
+have its own PID namespace.
+
+: When this option is set, no error is returned if the container is stopped
+or does not exist.
 
 # EXAMPLES