diff --git a/README.md b/README.md
index 611e3dd..eabca1f 100644
--- a/README.md
+++ b/README.md
@@ -141,14 +141,17 @@ Specify a Drupal project root or document root directory.
 
     drall --root=/path/to/drupal site:directories
 
-## Site groups
+### --drall-group
 
-Drall allows you to group your sites so that you can run commands on such
-groups with ease.
+Specify the target site group. See the section *site groups* for more
+information on site groups.
 
-```
-drall exec:drush --drall-group=GROUP core:rebuild
-```
+    drall exec:drush --drall-group=GROUP core:status --field=site
+
+## Site groups
+
+Drall allows you to group your sites so that you can run commands on these
+groups using the `--drall-group` option.
 
 ### Drall groups with site aliases