--- units-1.88.orig/units.info
+++ units-1.88/units.info
@@ -1,5 +1,6 @@
 This is units.info, produced by makeinfo version 4.13 from ./units.texinfo.
 
+INFO-DIR-SECTION Math
 START-INFO-DIR-ENTRY
 * units: (units).	Units conversion.
 END-INFO-DIR-ENTRY