diff --git a/specification/modules/content_repo.rst b/specification/modules/content_repo.rst
index 52937ead..fd797b2c 100644
--- a/specification/modules/content_repo.rst
+++ b/specification/modules/content_repo.rst
@@ -36,6 +36,10 @@ width and height are close to the requested size and the aspect matches
 the requested size. The client should scale the image if it needs to fit
 within a given rectangle.
 
+In summary:
+ * "scale" maintains the original aspect ratio of the image
+ * "crop" provides an image in the aspect ratio of the sizes given in the request
+
 Server behaviour
 ----------------