diff -r 4355a2afa7a3 -r f7e08143eea2 NEWS
--- a/NEWS	Fri Mar 14 18:02:16 2025 +0100
+++ b/NEWS	Fri Mar 14 18:04:14 2025 +0100
@@ -20,6 +20,8 @@
   - Changed definition of predicate refl_on to not constrain the domain
     and range of the relation. To get the old semantics, explicitely use
     the formula "r \<subset> A \<times> A \<and> refl_on A r". INCOMPATIBILITY.
+  - Strengthened lemmas. Minor INCOMPATIBILITY.
+      refl_on_empty[simp]
   - Added lemmas.
       reflp_on_refl_on_eq[pred_set_conv]