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--- a/README
+++ b/README
@@ -30,6 +30,23 @@ Zsh is a shell with lots of features. For a list of some of these, see the
file FEATURES, and for the latest changes see NEWS. For more
details, see the documentation.
+Incompatibilites between 5.0.8 and 5.0.9
+----------------------------------------
+
+As noted in NEWS, the builtins declare, export, float, integer, local,
+readonly and typeset now have corresponding reserved words that provide
+true assignment semantics instead of an approximation by means of normal
+command line arguments. It is hoped that this additional consistency
+provides a more natural interface. However, compatbility with older
+versions of zsh can be obtained by turning off the reserved word
+interface, exposing the builtin interface:
+
+ disable -r declare export float integer local readonly typeset
+
+This is also necessary in the unusual eventuality that the builtins are
+to be overridden by shell functions, since reserved words take
+precedence over functions.
+
Incompatibilites between 5.0.7 and 5.0.8
----------------------------------------