diff --git a/Dockerfile b/Dockerfile
index 3d55467..633ee2d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,3 +12,5 @@ RUN hugo --minify build
 FROM docker.io/caddy:${CADDY_VERSION}
 COPY Caddyfile /etc/caddy/Caddyfile
 COPY --from=builder /project/public /srv
+# tls.crt and tls.key should be mounted here at runtime.
+VOLUME /tls