diff --git a/.gitignore b/.gitignore
index 5719cc0..9e00113 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,8 @@
 # IDE-specific files
 .vscode/*
 .idea
+
+# This file is used in local development to pass an /app/.env
+# file to the container, for secrets. It should not be committed
+# to the repo because tests and CI/CD will not have an .env file.
+docker-compose.override.yml
\ No newline at end of file