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diff --git a/doc/regression.texi b/doc/regression.texi
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--- a/doc/regression.texi
+++ b/doc/regression.texi
@@ -2,6 +2,8 @@
 @comment  node-name,  next,  previous,  up
 @section REGRESSION
 
+@cindex regression
+@cindex linear regression
 The REGRESSION procedure fits linear models to data via least-squares
 estimation. The procedure is appropriate for data which satisfy those
 assumptions typical in linear regression: