diff --git a/docs/src/extensions.md b/docs/src/extensions.md
index 56f2edcc9..3e84f70d8 100644
--- a/docs/src/extensions.md
+++ b/docs/src/extensions.md
@@ -5,6 +5,11 @@ features that are not supported by GNU coreutils. We take care not to introduce
 features that are incompatible with the GNU coreutils. Below is a list of uutils
 extensions.
 
+## `env`
+
+`env` has an additional `-f`/`--file` flag that can parse `.env` files and set
+variables accordingly. This feature is adopted from `dotenv` style packages.
+
 ## `cp`
 
 `cp` can display a progress bar when the `-g`/`--progress` flag is set.
@@ -36,4 +41,5 @@ therefore welcomed.
 
 ## `cut`
 
-`cut` can separate fields by whitespace (Space and Tab) with `-w` flag. This feature is adopted from [FreeBSD](https://www.freebsd.org/cgi/man.cgi?cut).
\ No newline at end of file
+`cut` can separate fields by whitespace (Space and Tab) with `-w` flag. This
+feature is adopted from [FreeBSD](https://www.freebsd.org/cgi/man.cgi?cut).