diff --git a/README.md b/README.md
index f8da141..492f3fa 100644
--- a/README.md
+++ b/README.md
@@ -256,6 +256,8 @@ The [readme](https://github.com/ionous/tell/blob/main/note/README.md)  in `packa
 Version History
 -----
 
+0.9.0 -> 0.9.1: improved error reporting for package charm.
+
 0.8.1 -> 0.9.0: changes string folding; adds new string types.
 
   - scalar strings can now span lines. they follow the same rules as yaml's strings.