diff --git a/doc/forum/Reverse_index_key_to_list_of_file_paths/comment_3_6b75bd75623004f05f609a39e95250ab._comment b/doc/forum/Reverse_index_key_to_list_of_file_paths/comment_3_6b75bd75623004f05f609a39e95250ab._comment
new file mode 100644
index 0000000000..fc523c098c
--- /dev/null
+++ b/doc/forum/Reverse_index_key_to_list_of_file_paths/comment_3_6b75bd75623004f05f609a39e95250ab._comment
@@ -0,0 +1,33 @@
+[[!comment format=mdwn
+ username="nguenthe@0f416ab0ba07a395eb8a0c85732e0105e4970e10"
+ nickname="nguenthe"
+ avatar="http://cdn.libravatar.org/avatar/0e245fd49594e98b19d4c57efcb134ad"
+ subject="comment 3"
+ date="2021-02-09T17:06:24Z"
+ content="""
+I just figured this out today!
+
+In v8 repos, every annexed file gets replaced by a text string like this:
+
+```
++/annex/objects/SHA256E-s320029--488e29f5584ba4e474db95aa42fbb58ddb92f2a59bc0b24a91171acb4d8f4828.png
+```
+
+((
+
+you can see them with `git log -p` or
+
+```
+$ git show HEAD:vlcsnap-2019-03-22-03h42m47s659.png
+/annex/objects/SHA256E-s320029--488e29f5584ba4e474db95aa42fbb58ddb92f2a59bc0b24a91171acb4d8f4828.png
+```
+
+))
+
+So to get the reverse pointer, you can use `git grep`:
+
+```
+$ git grep SHA256E-s320029--488e29f5584ba4e474db95aa42fbb58ddb92f2a59bc0b24a91171acb4d8f4828.png HEAD
+HEAD:vlcsnap-2019-03-22-03h42m47s659.png:/annex/objects/SHA256E-s320029--488e29f5584ba4e474db95aa42fbb58ddb92f2a59bc0b24a91171acb4d8f4828.png
+```
+"""]]
diff --git a/doc/forum/Reverse_index_key_to_list_of_file_paths/comment_4_e54268d93837b3b8e216ec6af074f3c6._comment b/doc/forum/Reverse_index_key_to_list_of_file_paths/comment_4_e54268d93837b3b8e216ec6af074f3c6._comment
new file mode 100644
index 0000000000..6c3db9d361
--- /dev/null
+++ b/doc/forum/Reverse_index_key_to_list_of_file_paths/comment_4_e54268d93837b3b8e216ec6af074f3c6._comment
@@ -0,0 +1,9 @@
+[[!comment format=mdwn
+ username="nguenthe@0f416ab0ba07a395eb8a0c85732e0105e4970e10"
+ nickname="nguenthe"
+ avatar="http://cdn.libravatar.org/avatar/0e245fd49594e98b19d4c57efcb134ad"
+ subject="comment 4"
+ date="2021-02-09T17:09:15Z"
+ content="""
+`git grep` might be just as slow as `find` in the end, but so far it has always been very fast for me. Maybe I just don't have a hyper-huge number of files.
+"""]]