Update docs/modes-of-operation.rst

Co-authored-by: Remi Gacogne <rgacogne+github@valombre.net>

diff --git a/docs/modes-of-operation.rst b/docs/modes-of-operation.rst
index 268f88f5e3d367b0e2e084edafdf8fe14aea71b7..ee1d1a27fc634b90e849807ba0df7a1bc8f0110d 100644 (file)
--- a/docs/modes-of-operation.rst
+++ b/docs/modes-of-operation.rst
@@ -140,7 +140,7 @@ Slave operation can also be programmed using several
 command is especially useful as it triggers an immediate retrieval of
 the zone from the configured master.
 
-Zone transfers are added to a queue and processed according to priority
+Since 4.5.0, zone transfers are added to a queue and processed according to priority
 and order of addition. Order levels are (from high to low): pdns control,
 api, notify, serial changed during refresh and signatures changed during
 refresh. High priority zone transfers are always processed first, in a