diff -r 7b5d08e84c4d -r 6c02b9ac2832 CHANGELOG
--- a/CHANGELOG	Sat Jul 20 17:33:00 2019 +0800
+++ b/CHANGELOG	Fri Aug 02 13:00:11 2019 -0700
@@ -1,6 +1,11 @@
 Changelog
 =========
 
+9.1.0 - in progress
+-------------------
+
+  * prune: clarify error message when no revision were passed,
+
 9.1.0 -- 2019-07-29
 -------------------