diff --git a/doc/todo/registerurl__58___do_changes_in_journal___34__in_place__34____63__.mdwn b/doc/todo/registerurl__58___do_changes_in_journal___34__in_place__34____63__.mdwn
index f6a50bcff5..8d4b2887b9 100644
--- a/doc/todo/registerurl__58___do_changes_in_journal___34__in_place__34____63__.mdwn
+++ b/doc/todo/registerurl__58___do_changes_in_journal___34__in_place__34____63__.mdwn
@@ -29,3 +29,5 @@ may be there is a way to "stagger" those --batch additions somehow so all thousa
 PS More information could be found at [dandisets/issues/225](https://github.com/dandi/dandisets/issues/225 )
 
 [[!tag projects/dandi]]
+
+> [[fixed|done]], see my last comment for what you need to do. --[[Joey]]
diff --git a/doc/todo/registerurl__58___do_changes_in_journal___34__in_place__34____63__/comment_21_953eaa6ca651597897a6c6ad7a259d1d._comment b/doc/todo/registerurl__58___do_changes_in_journal___34__in_place__34____63__/comment_21_953eaa6ca651597897a6c6ad7a259d1d._comment
new file mode 100644
index 0000000000..b417b0a756
--- /dev/null
+++ b/doc/todo/registerurl__58___do_changes_in_journal___34__in_place__34____63__/comment_21_953eaa6ca651597897a6c6ad7a259d1d._comment
@@ -0,0 +1,20 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 21"""
+ date="2022-07-20T17:24:25Z"
+ content="""
+I've finished implementing appending.
+
+In order to avoid stacking up a year-long v10-v12 upgrade behind the current 
+v8-v10 upgrade, appending will for now only be done when
+annex.alwayscompact=false. ([[todo/v11_changes]] has been made to remind
+me to revisit this later.)
+
+That config is necessary for optimal speed in your situation anyway.
+
+You should avoid setting annex.alwayscompact=false if there is an older
+git-annex also installed on the machine, that could be run in the
+repository at the same time as a git-annex process that is doing appends.
+Otherwise, you do risk the old process seeing partial/interrupted appends
+and getting confused.
+"""]]