diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 8e0231e0..2c92a4e2 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -4,6 +4,7 @@ sc_usb_audio Change Log
 6.30.0
 ------
     - RESOLVED:   PDM microphone clock divide now based MCLK defines (previously hard-coded)
+    - CHANGE:     Second microphone decimation core only run if NUM_PDM_MICS > 4
 
 6.20.0
 ------