diff --git a/9.6/Dockerfile b/9.6/Dockerfile
index fdfc0f6c6d..79714160d1 100644
--- a/9.6/Dockerfile
+++ b/9.6/Dockerfile
@@ -68,11 +68,15 @@ RUN mkdir -p /var/run/postgresql && chown -R postgres:postgres /var/run/postgres
 
 ENV PATH /usr/lib/postgresql/$PG_MAJOR/bin:$PATH
 ENV PGDATA /var/lib/postgresql/data
-RUN mkdir -p "$PGDATA" && chown -R postgres:postgres "$PGDATA" && chmod 777 "$PGDATA" # this 777 will be replaced by 700 at runtime (allows semi-arbitrary "--user" values)
+
+# this 777 will be replaced by 700 at runtime (allows semi-arbitrary "--user" values)
+RUN mkdir -p "$PGDATA" && chown -R postgres:postgres "$PGDATA" && chmod 777 "$PGDATA" 
 VOLUME /var/lib/postgresql/data
 
 COPY docker-entrypoint.sh /usr/local/bin/
-RUN ln -s usr/local/bin/docker-entrypoint.sh / # backwards compat
+
+# For backwards compatibility.
+RUN ln -s usr/local/bin/docker-entrypoint.sh / 
 ENTRYPOINT ["docker-entrypoint.sh"]
 
 EXPOSE 5432