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diff --git a/doc/ref/r6rs.texi b/doc/ref/r6rs.texi
index 9d326ff09..5c1c1b18f 100644
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+++ b/doc/ref/r6rs.texi
@@ -45,6 +45,11 @@ R6RS behavior can be turned on via a reader option. @xref{String
Syntax}, for more information.
@item
+Guile does not yet support Unicode escapes in symbols, such as
+@code{H\x65;llo} (the same as @code{Hello}), or @code(\x3BB;) (the same
+as @code{λ}).
+
+@item
A @code{set!} to a variable transformer may only expand to an
expression, not a definition---even if the original @code{set!}
expression was in definition context.