diff --git a/tools/unicodetools/readme.txt b/tools/unicodetools/readme.txt
index 882645bace7..99edf39e6c7 100644
--- a/tools/unicodetools/readme.txt
+++ b/tools/unicodetools/readme.txt
@@ -1 +1,11 @@
-readme.
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+WARNING!!
+
+These directories contain some Unicode tools used to build various files,
+and to check the consistency of the Unicode releases.
+
+They are NOT production level code, and should never be used in programs.
+The API is subject to change without notice, and will not be maintained.
+The source is uncommented, and not well structured -- classic spaghetti style.
+
+There is no build mechanism. Visual Cafe files are included, but
+may not be up-to-date.
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