Put entire GiNaC documentation into @dircategory 'Mathematics' for info.

diff --git a/doc/tutorial/ginac.texi b/doc/tutorial/ginac.texi
index c92e38dcf9b8e6112b9919d9cbab8433d4b52964..a6befadbcb84506e72c7ac5b0ef83efafb47e549 100644 (file)
--- a/doc/tutorial/ginac.texi
+++ b/doc/tutorial/ginac.texi
@@ -15,6 +15,7 @@
 
 @include version.texi
 
+@dircategory Mathematics
 @direntry
 * ginac: (ginac).                   C++ library for symbolic computation.
 @end direntry