diff --git a/kernel/fork.c b/kernel/fork.c
index 0d62524c6660..b9d857fe2a5c 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1587,6 +1587,10 @@ static __latent_entropy struct task_struct *copy_process(
 	int retval;
 	struct task_struct *p;
 
+	/*
+	 * Don't allow sharing the root directory with processes in a different
+	 * namespace
+	 */
 	if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS))
 		return ERR_PTR(-EINVAL);