DOC-4944 added another headline note

Author: andy-stark-redis

content/integrate/redis-data-integration/release-notes/rdi-1-6-1.md

@@ -42,6 +42,7 @@ It also lets you _transform_ the data from relational tables into convenient and
 - Fixed RDI 1.6.0 installation failure for HA due to `rdi-operator` deployment timeout.
 - Added support for downloading Debezium image from a private registry.
 - VM Installer now supports Ubuntu 22.04 and Ubuntu 24.04.
+- Resolved performance degradation in 1.6.0 that caused the initial sync to be 3-5 times slower.
 
 ## Limitations