Add a note about Cabal's parsec flag

phadej · phadej · commit c97bd1a9c887 · 2017-01-26T14:39:33.000+02:00
diff --git a/cabal-install/cabal-install.cabal b/cabal-install/cabal-install.cabal
@@ -195,7 +195,7 @@ Flag debug-tracetree
   default:      False
 
 flag parsec
-  description:  Use parsec parser
+  description:  Use parsec parser. This requires 'Cabal' library built with its parsec flag enabled.
   default:      False
   manual:       True
 
