diff --git a/ChangeLog b/ChangeLog
index ecb82b19e..369ea7e2e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -176,6 +176,10 @@
   task becomes visible.
 - New 'rule.color.merge=yes|no' configuration option, that can optionally
   turn off color blending engine.
+- The 'urgency.next.coefficient' configuration option is deprecated in favor
+  of 'urgency.user.tag.next.coefficient'.
+- The long deprecated syntax of color values with underscores (i.e 'on_red')
+  is no longer supported.
 
 ------ current release ---------------------------
 
diff --git a/NEWS b/NEWS
index ef262d8f6..817042c23 100644
--- a/NEWS
+++ b/NEWS
@@ -45,6 +45,8 @@ Removed features in 2.4.5
     IDs, UUIDs, and various date/time formats ambiguous.
   - Comma-separated UUID lists are no longer supported.
   - DOM references may no longer be abbreviated.
+  - The long deprecated syntax of color values with underscores (i.e 'on_red')
+    is no longer supported.
 
 Known Issues