update README

README.md

@@ -15,9 +15,10 @@ The information about the token uuids can you get on your build configuration si
 ### Usage
 You can now trigger a rebuild of your images with:
 ```
+./trigger <service> <tag|all>
+```
+**Example:**
+```
 ./trigger dummy latest
-```
-or
-```
 ./trigger dummy all
 ```