diff --git a/docker/puppetserver/docker-entrypoint.sh b/docker/puppetserver/docker-entrypoint.sh
index f85a45b1d..1a16c6f19 100755
--- a/docker/puppetserver/docker-entrypoint.sh
+++ b/docker/puppetserver/docker-entrypoint.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+# bash is required to pass ENV vars with dots as sh cannot
 
 set -e