diff --git a/UPGRADE-2.6.md b/UPGRADE-2.6.md
index 2339eea368aa..ce995b6d7b8f 100644
--- a/UPGRADE-2.6.md
+++ b/UPGRADE-2.6.md
@@ -7,9 +7,16 @@ Known Backwards-Compatibility Breaks
 * If you use the `PdoSessionHandler`, the session table now has a different
   schema and must be modified. Look below for more details.
 
+* The `model_timezone` and `view_timezone` options were dropped from certain
+  date form fields. See below for details.
+
 Form
 ----
 
+ * The `model_timezone` and `view_timezone` options were dropped from the
+   `date` and `time` form field types (as well as any others that use these,
+   like `birthday`).
+
  * The "empty_value" option in the types "choice", "date", "datetime" and "time"
    was deprecated and replaced by a new option "placeholder". You should use
    the option "placeholder" together with the view variables "placeholder" and