diff --git a/kea-multithreading-packet-processing-requirements.md b/kea-multithreading-packet-processing-requirements.md
index b3de7d7..9efb940 100644
--- a/kea-multithreading-packet-processing-requirements.md
+++ b/kea-multithreading-packet-processing-requirements.md
@@ -3,6 +3,8 @@
 * It must not break the DHCP protocol
 * It must support MySql and PgSql back-ends
 * It must be configurable in the configuration file, at run-time using control channel commands or on the command line (still in discussion).
+* It must improve the server performance with at least a factor of %% (still in discussion - best scenario: should scale linearly with the increase of CPU count)
+* Should not have impact on the old server functionality if the feature is disabled
 * It might support Memfile and Cassanra back-ends
 * It might support using hooks (some, all or none)