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diff --git a/doc/lispref/variables.texi b/doc/lispref/variables.texi
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+++ b/doc/lispref/variables.texi
@@ -1838,6 +1838,7 @@ updates this list.
@node Variable Aliases
@section Variable Aliases
@cindex variable aliases
+@cindex alias, for variables
It is sometimes useful to make two variables synonyms, so that both
variables always have the same value, and changing either one also