diff --git a/README.md b/README.md
index c04d56b..75e87c4 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ mongo:create <name>            Create a mongo service with environment variables
 mongo:destroy <name>           Delete the service, delete the data and stop its container if there are no links left
 mongo:enter <name> [command]   Enter or run a command in a running mongo service container
 mongo:exists <service>         Check if the mongo service exists
-mongo:export <name> > <file>   Export a dump of the mongo service database
+mongo:export <name> > <file>   Export a dump of the mongo service database (as gzipped archive file)
 mongo:expose <name> [port]     Expose a mongo service on custom port if provided (random port otherwise)
 mongo:import <name> < <file>   Import a dump into the mongo service database
 mongo:info <name>              Print the connection information