diff --git a/PostgreSQL.md b/PostgreSQL.md
index 6aa1224..eeb9bd3 100644
--- a/PostgreSQL.md
+++ b/PostgreSQL.md
@@ -1,3 +1,11 @@
-https://github.com/wekan/wekan-postgresql
+# FerretDB
 
-TODO: Look at [this posting](https://plus.google.com/100130971560879475093/posts/2rMN5Lr9RcR)
\ No newline at end of file
+Replacing MongoDB with FerretDB/SQLite or FerretDB/PostgreSQL. Needs testing, what are correct settings.
+
+https://forums.meteor.com/t/ferretdb-1-18-now-has-oplog-support-trying-replace-mongodb-6-x-with-ferretdb-postgresql-or-ferretdb-sqlite/61092
+
+# ToroDB
+
+ToroDB is not developed anymore. ToroDB was about adding MongoDB proxy to PostgreSQL or MySQL.
+
+https://github.com/wekan/wekan/tree/main/torodb-postgresql