some more info in README.md

@@ -30,7 +30,9 @@ because password values are copied into the X clipboard via
 [GnuPG](https://www.gnupg.org/) using my private key. Usually my credentials
 for that key are already cached within a running **gpg-agent** instance.
 The storage backend is an [SQLite](https://www.sqlite.org/) (>= 3.6.19)
-database. The default database file to use can be set with the
+database. For more dependencies see [DEPENDENCIES](#dependencies).
+
+The default database file to use can be set with the
 **AMNGRDB** environment variable and the GnuPG recipient should be set
 in the **AMNGRID** environment variable. (See [OPTIONS](#options))