Fix a small error in an img_id example in the docs

The pithosmap URI needs an image size in the end

diff --git a/docs/interface.rst b/docs/interface.rst
index 5998cfc..c2d1818 100644 (file)
--- a/docs/interface.rst
+++ b/docs/interface.rst
@@ -75,7 +75,7 @@ to be used. If no prefix is used, it defaults to the local back-end:
   | For example, if we want to deploy using a full Pithos URI:
   | ``img_id=pithos://<user-uuid>/<container>/<slackware-image>``
   | or if we already know the map:
-  | ``img_id=pithosmap://<slackware-image-map-name>``
+  | ``img_id=pithosmap://<slackware-image-map-name>/<size>``
 
  * **Null back-end**:
    To select the Null back-end and skip the fetching and extraction step, we set