diff --git a/README b/README
index 5aa0aca..a1ae805 100644
--- a/README
+++ b/README
@@ -234,8 +234,10 @@
 parameters.
 
 Merging of parameters is done recursively, meaning that lists and dictionaries
-are extended, rather than replaced. There is currently no way to remove or
-overwrite an existing value.
+are extended (recursively), rather than replaced. However, a scalar value
+*does* overwrite a dictionary or list value. While the scalar could be
+appended to an existing list, there is sane default assumption in the context
+of a dictionary, so this behaviour seems the most logical.
 
 Finally, parameters may reference each other, including deep references, e.g.: