diff --git a/man2/pivot_root.2 b/man2/pivot_root.2
index 5b4e38659..6853e9bd9 100644
--- a/man2/pivot_root.2
+++ b/man2/pivot_root.2
@@ -94,6 +94,14 @@ similarly, if
 .I put_old
 is an existing mount point, its propagation type must not be
 .BR MS_SHARED .
+.\" FIXME
+.\" mtk: I am very suspicious of the following paragraph. My testing suggests
+.\" that pivot_root() fails with the error EINVAL in the case where
+.\" the current root (after chroot()) is not a mount point. And tehre are
+.\" these lines in pivot_root():
+.\"        error = -EINVAL;
+.\"        if (root.mnt->mnt_root != root.dentry)
+.\"                goto out4; /* not a mountpoint */
 .PP
 If the current root is not a mount point (e.g., after an earlier
 .BR chroot (2)),