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diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
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@@ -47,6 +47,7 @@ fixes/update part 1.1 Stefani Seibold <stefani@seibold.net> June 9 2009
3.10 /proc/<pid>/timerslack_ns - Task timerslack value
3.11 /proc/<pid>/patch_state - Livepatch patch operation state
3.12 /proc/<pid>/arch_status - Task architecture specific information
+ 3.13 /proc/<pid>/fd - List of symlinks to open files
4 Configuring procfs
4.1 Mount options
@@ -2150,6 +2151,22 @@ AVX512_elapsed_ms
the task is unlikely an AVX512 user, but depends on the workload and the
scheduling scenario, it also could be a false negative mentioned above.
+3.13 /proc/<pid>/fd - List of symlinks to open files
+-------------------------------------------------------
+This directory contains symbolic links which represent open files
+the process is maintaining. Example output::
+
+ lr-x------ 1 root root 64 Sep 20 17:53 0 -> /dev/null
+ l-wx------ 1 root root 64 Sep 20 17:53 1 -> /dev/null
+ lrwx------ 1 root root 64 Sep 20 17:53 10 -> 'socket:[12539]'
+ lrwx------ 1 root root 64 Sep 20 17:53 11 -> 'socket:[12540]'
+ lrwx------ 1 root root 64 Sep 20 17:53 12 -> 'socket:[12542]'
+
+The number of open files for the process is stored in 'size' member
+of stat() output for /proc/<pid>/fd for fast access.
+-------------------------------------------------------
+
+
Chapter 4: Configuring procfs
=============================