diff --git a/dockerfile b/dockerfile
index 0bf277b..5cfb822 100644
--- a/dockerfile
+++ b/dockerfile
@@ -3,6 +3,7 @@
 #   docker run -e INSTAGRAM_TOKEN=XXX -p 3333:3333 -v $(pwd)/data:/data osia
 FROM alpine:3.14
 COPY --chmod=0755 ./osia-linux-amd64 /osia
+EXPOSE 3333
 RUN mkdir /data
 ENTRYPOINT ["/osia",  "--interval", "30m", "--dbfilepath", "/data/osia.db", \
   "--imagesfolder", "/data/images/", "--listen", "0.0.0.0:3333"]
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