While probably not widely used by third-party tools,
the IAllocator protocol still is an external interface
of Ganeti. So mention the extension of the protocol and
describe how users can continue to use their third-party
IAllocator not aware of that extension.

Signed-off-by: Klaus Aehlig <[email protected]>
---
 NEWS | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/NEWS b/NEWS
index ec53ea7..12cf2d7 100644
--- a/NEWS
+++ b/NEWS
@@ -7,6 +7,15 @@ Version 2.16.0
 
 *(unreleased)*
 
+Incompatible/important changes
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- The IAllocator protocol has been extended by a new ``allocate-secondary``
+  request type. Currently, this new request type is only used when in disk
+  conversion to DRBD no secondary node is specified. As long as this new
+  feature is not used, a third-party IAllocator not aware of this extension can
+  be continued to be used.
+
 New dependencies
 ~~~~~~~~~~~~~~~~
 
-- 
2.2.0.rc0.207.ga3a616c

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