diff -r ca656b431267 -r ebd586aa5b00 doc/book/devrepo/migration.rst
--- a/doc/book/devrepo/migration.rst	Thu Dec 17 15:16:14 2015 +0100
+++ b/doc/book/devrepo/migration.rst	Thu Dec 10 17:34:37 2015 +0100
@@ -108,6 +108,7 @@
 If some of the added cubes are already used by an instance, they'll simply be
 silently skipped.
 
+To remove a cube use `drop_cube(cube, removedeps=False)`. 
 
 Schema migration
 ----------------