update CHANGES

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diff --git a/CHANGES b/CHANGES
index 26f07540ad..0afe588d60 100644
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+++ b/CHANGES
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+Changes from 8.8.2 to 8.9+beta1
+===============================
+
+Tools
+
+- Coq_makefile lets one override or extend the following variables from
+  the command line: COQFLAGS, COQCHKFLAGS, COQDOCFLAGS.
+
 Changes from 8.7.2 to 8.8+beta1
 ===============================