diff --git a/pages/common/ps.md b/pages/common/ps.md
index f6c5e4f7c6..c5949a6208 100644
--- a/pages/common/ps.md
+++ b/pages/common/ps.md
@@ -21,3 +21,7 @@
 - List all processes of the current user as a tree:
 
 `ps --user $(id -u) f`
+
+- Get the parent pid of a process:
+
+`ps -o ppid= -p {{pid}}`