diff --git a/pages/common/p4.md b/pages/common/p4.md
index 56e24fd775..f1e66b8615 100644
--- a/pages/common/p4.md
+++ b/pages/common/p4.md
@@ -1,6 +1,7 @@
 # p4
 
 > Perforce Version Control System.
+> More information: <https://www.perforce.com/manuals/cmdref>.
 
 - Log in to the Perforce service: