Clarify the implications of not providing dns_get_all_domains.

Signed-off-by: Miod Vallat <miod.vallat@powerdns.com>

diff --git a/docs/backends/lua2.rst b/docs/backends/lua2.rst
index 99dba66bba85d696d018ead05a0dd917e7f4603d..76f8174fd8dd7faa9b12174170065b5e62f85b72 100644 (file)
--- a/docs/backends/lua2.rst
+++ b/docs/backends/lua2.rst
@@ -19,7 +19,7 @@ Lua2 Backend
 * Module name: lua2
 * Launch name: ``lua2``
 
-\* If provided by the responder (your script).
+\* If the responder (your script) implements ``dns_get_all_domains``, see below.
 
 This is a rewrite of existing Lua backend.
 This backend is stub between your Lua script and PowerDNS authoritative server.
@@ -124,7 +124,8 @@ OUTPUT:
 
 NOTES:
  This function is **optional**, except if you need primary functionality. It
- is required if you want to be able to search records.
+ is required if you want to be able to enable the zone cache or to search
+ records.
 
 ``dns_get_domain_metadata(domain, kind)``
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~