diff --git a/Dockerfile b/Dockerfile
index 138ca09..e91550f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -39,4 +39,5 @@ ENV AUDIO_FORMATS=.mp3,.wav,.ogg,.aac,.flac \
     REDIRECT_URL=https://example.com
 
 RUN npm ci
-CMD ["node", "index.js"]
\ No newline at end of file
+EXPOSE ${PORT}/tcp
+CMD ["node", "index.js"]