diff --git a/CHANGELOG b/CHANGELOG
index 46e6723268..b00b6ae1a6 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,7 @@
 git-annex (8.20210429) UNRELEASED; urgency=medium
 
+  * filter-branch: New command, useful to produce a filtered version of the
+    git-annex branch, eg when splitting a repository.
   * fromkey: Create an unlocked file when used in an adjusted branch
     where the file should be unlocked, or when configured by annex.addunlocked.
   * Fix behavior of several commands, including reinject, addurl, and rmurl
diff --git a/doc/todo/copy-key___40__--batch__41___to_copy__47__merge_availability_info.mdwn b/doc/todo/copy-key___40__--batch__41___to_copy__47__merge_availability_info.mdwn
index 45ac42ead9..0e7c150684 100644
--- a/doc/todo/copy-key___40__--batch__41___to_copy__47__merge_availability_info.mdwn
+++ b/doc/todo/copy-key___40__--batch__41___to_copy__47__merge_availability_info.mdwn
@@ -14,3 +14,5 @@ WDYT Joey?
 [[!tag projects/datalad]]
 
 > In progress in the `filter-branch` branch. --[[Joey]]
+
+> [[done]] --[[Joey]]
diff --git a/doc/todo/copy-key___40__--batch__41___to_copy__47__merge_availability_info/comment_6_e479e9b65a512727f2816d4abd72b900._comment b/doc/todo/copy-key___40__--batch__41___to_copy__47__merge_availability_info/comment_6_e479e9b65a512727f2816d4abd72b900._comment
new file mode 100644
index 0000000000..476f389b54
--- /dev/null
+++ b/doc/todo/copy-key___40__--batch__41___to_copy__47__merge_availability_info/comment_6_e479e9b65a512727f2816d4abd72b900._comment
@@ -0,0 +1,7 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 6"""
+ date="2021-05-17T18:15:55Z"
+ content="""
+This is implemented.
+"""]]