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-rw-r--r--doc/lispref/variables.texi3
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diff --git a/doc/lispref/variables.texi b/doc/lispref/variables.texi
index e890dbce359..b3466e60c4e 100644
--- a/doc/lispref/variables.texi
+++ b/doc/lispref/variables.texi
@@ -1951,6 +1951,7 @@ foo
@node Variables with Restricted Values
@section Variables with Restricted Values
+@cindex lisp variables defined in C, restrictions
Ordinary Lisp variables can be assigned any value that is a valid
Lisp object. However, certain Lisp variables are not defined in Lisp,
@@ -1987,6 +1988,8 @@ Attempting to assign them any other value will result in an error:
@node Generalized Variables
@section Generalized Variables
+@cindex generalized variable
+@cindex place form
A @dfn{generalized variable} or @dfn{place form} is one of the many places
in Lisp memory where values can be stored. The simplest place form is
a regular Lisp variable. But the @sc{car}s and @sc{cdr}s of lists, elements