diff --git a/man7/pipe.7 b/man7/pipe.7
index cff9b75e9..277cb8af6 100644
--- a/man7/pipe.7
+++ b/man7/pipe.7
@@ -196,6 +196,11 @@ Attempts to set a limit less than the page size cause
 .BR write (2)
 to fail with the error
 .BR EINVAL .
+
+Since Linux 4.9,
+.\" commit 086e774a57fba4695f14383c0818994c0b31da7c
+the value on this file also acts as a ceiling on the default capacity
+of a new pipe or newly opened FIFO.
 .TP
 .IR /proc/sys/fs/pipe-user-pages-hard " (since Linux 4.5)"
 .\" commit 759c01142a5d0f364a462346168a56de28a80f52