2 files changed, 5 insertions, 0 deletions

diff --git a/doc/lispref/ChangeLog b/doc/lispref/ChangeLog
index e6a71b01660..ce2ff2e1665 100644
--- a/doc/lispref/ChangeLog
+++ b/doc/lispref/ChangeLog
@@ -1,3 +1,7 @@
+2013-10-05  Xue Fuqiao  <xfq.free@gmail.com>
+
+        * syntax.texi (Categories): Add an index for category sets.
+
 2013-10-03  Xue Fuqiao  <xfq.free@gmail.com>
 
         * syntax.texi (Syntax Flags):
diff --git a/doc/lispref/syntax.texi b/doc/lispref/syntax.texi
index 45b73e31e8b..cdc82b00385 100644
--- a/doc/lispref/syntax.texi
+++ b/doc/lispref/syntax.texi
@@ -1060,6 +1060,7 @@ standard categories are available in all modes.
 the range @w{@samp{ }} to @samp{~}.  You specify the name of a category
 when you define it with @code{define-category}.
 
+@cindex category set
   The category table is actually a char-table (@pxref{Char-Tables}).
 The element of the category table at index @var{c} is a @dfn{category
 set}---a bool-vector---that indicates which categories character @var{c}