CHANGELOG: add entry about odb registration
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f77c195..334bd76 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,11 @@
the opportunity for concurrent operations and not committing any
changes until the unlock.
+* `git_odb_register()` allows you to register a constructor to be
+ called when the repository has an extension `extensions.odb` with
+ the value you provide as a name. This object db will be used instead
+ of the default one.
+
### API removals
### Breaking API changes
