Added better description to docker env vars

start-postgis.sh

@@ -63,7 +63,8 @@ if [ -z "$TOPOLOGY" ]; then
   TOPOLOGY=true
 fi  
 
-# Customize IP range
+# Custom IP range via docker run -e (https://docs.docker.com/engine/reference/run/#env-environment-variables)
+# Usage is: docker run [...] -e ALLOW_IP_RANGE='192.168.0.0/16' 
 if [ "$ALLOW_IP_RANGE" ]
 then
   echo "host    all             all             $ALLOW_IP_RANGE              md5" >> /etc/postgresql/9.4/main/pg_hba.conf