--- bc-1.06.95.orig/doc/dc.texi
+++ bc-1.06.95/doc/dc.texi
@@ -22,6 +22,7 @@
 @syncodeindex pg fn
 @syncodeindex tp fn
 
+@dircategory Math
 @ifinfo
 @direntry
 * dc: (dc).                   Arbitrary precision RPN ``Desktop Calculator''.