diff --git a/man5/proc.5 b/man5/proc.5
index cb85b9b2b..85df02a45 100644
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -1099,8 +1099,17 @@ and
 .TP
 .IR /proc/[pid]/mountinfo " (since Linux 2.6.26)"
 .\" This info adapted from Documentation/filesystems/proc.txt
+.\" commit 2d4d4864ac08caff5c204a752bd004eed4f08760
 This file contains information about mount points.
-It contains lines of the form:
+It supplies various information
+(e.g., propagation state, root of mount for bind mounts,
+identifier for each mount and its parent) that is missing from the (older)
+.IR /proc/[pid]/mounts
+file, and fixes various other problems with that file
+(e.g., nonextensibility,
+failure to distinguish per-mount versus per-superblock options).
+
+The file contains lines of the form:
 .nf
 .ft CW