auth docs: add lmdb backend to backends index

diff --git a/docs/backends/index.rst b/docs/backends/index.rst
index a4403bccc87fb46377b1fd71a1c93d0e99d837ca..084378bdba9b2ec4207233fcdc1d0769cba765ea 100644 (file)
--- a/docs/backends/index.rst
+++ b/docs/backends/index.rst
@@ -59,6 +59,7 @@ These backends have :doc:`features unique <generic-sql>` to the generic SQL back
   generic-sqlite3
   geoip
   ldap
+  lmdb
   lua
   lua2
   mydns