diff --git a/docs/reference/compose_exec.md b/docs/reference/compose_exec.md
index b9f5ae2d50..0bbe02ec60 100644
--- a/docs/reference/compose_exec.md
+++ b/docs/reference/compose_exec.md
@@ -24,3 +24,6 @@ This is the equivalent of `docker exec` targeting a Compose service.
 
 With this subcommand, you can run arbitrary commands in your services. Commands allocate a TTY by default, so
 you can use a command such as `docker compose exec web sh` to get an interactive prompt.
+
+Environment from existing configuration is preserved.
+You can for instance introspect your environment by running `docker-compose exec web "/usr/bin/env"`.