diff --git a/Dockerfile b/Dockerfile
index ebbf652..3fd565e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,6 +14,7 @@ RUN \
   adduser -s /bin/sh -D user &&\
   mkdir -p $APP_DIR &&\
   chown user:user $APP_DIR &&\
+  echo $ADDITIONAL_CA_URL &&\
   if [ "$ADDITIONAL_CA_URL" != "x" ]; then \
     cd /usr/share/ca-certificates; \
     wget --no-check-certificate -O custom-ca.crt $ADDITIONAL_CA_URL; \