diff --git a/docs/src/extensions.md b/docs/src/extensions.md
index 2319b2a6f..61c25ba48 100644
--- a/docs/src/extensions.md
+++ b/docs/src/extensions.md
@@ -82,3 +82,10 @@ We support `--sort=name`, which makes it possible to override an earlier value.
 
 `du` allows `birth` and `creation` as values for the `--time` argument to show the creation time. It
 also provides a `-v`/`--verbose` flag.
+
+## `id`
+
+`id` has three additional flags: 
+* `-P` displays the id as a password file entry
+* `-p` makes the output human-readable
+* `-A` displays the process audit user ID