diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 38a36345e..d1ee2f05b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -98,7 +98,14 @@ pnpm run dokploy:build
 
 ## Docker
 
-To build the docker image
+To build the docker image first run commands to copy .env files
+
+```bash
+cp apps/dokploy/.env.production.example .env.production
+cp apps/dokploy/.env.production.example apps/dokploy/.env.production
+```
+
+then run build command
 
 ```bash
 pnpm run docker:build