diff --git a/man7/user_namespaces.7 b/man7/user_namespaces.7
index 4aac4b2fc..0658b7fac 100644
--- a/man7/user_namespaces.7
+++ b/man7/user_namespaces.7
@@ -807,3 +807,7 @@ main(int argc, char *argv[])
 .BR capabilities (7)
 .BR namespaces (7),
 .BR pid_namespaces (7)
+.sp
+The kernel source file
+.IR Documentation/namespaces/resource-control.txt .
+