diff --git a/dockerfile b/dockerfile
index 8d2cb4f..728c9ae 100644
--- a/dockerfile
+++ b/dockerfile
@@ -23,6 +23,7 @@ COPY ./start-slapd.sh ./start-slapd.sh
 RUN chmod +x ./start-slapd.sh
 
 # open up LDAP simple port
+EXPOSE 389
 EXPOSE 636
 
 # set salvable volumes for LDAP data, configuration