diff --git a/src/Data/Url/Types.hs b/src/Data/Url/Types.hs
--- a/src/Data/Url/Types.hs
+++ b/src/Data/Url/Types.hs
@@ -63,13 +63,17 @@
 
 infixl 8 <&>
 
--- | Adds a hash parameter to a @QueryString@.
-(<#>) :: ( TextualMonoid a ) =>
-         QueryString a
-      -> a
-      -> QueryString a
-(<#>) (QueryString !t !p _) !h = QueryString t p $ Just h
+class Hashable l r where
+  -- | Adds a hash parameter to a @QueryString@.
+  (<#>) :: l -> r -> QueryString r
 
+instance ( TextualMonoid a ) => Hashable a a where
+  (<#>) t h = QueryString t [] $ Just h
+
+instance ( TextualMonoid a ) => Hashable (QueryString a) a where
+  (<#>) (QueryString !t !p _) !h = QueryString t p $ Just h
+
+infixl 7 <#>
 
 fromRoute :: ( TextualMonoid a ) =>
              ([a], [(a, a)])
diff --git a/urlpath.cabal b/urlpath.cabal
--- a/urlpath.cabal
+++ b/urlpath.cabal
@@ -1,5 +1,5 @@
 Name:                   urlpath
-Version:                2.0.0
+Version:                2.1.0
 Author:                 Athan Clark <athan.clark@gmail.com>
 Maintainer:             Athan Clark <athan.clark@gmail.com>
 License:                MIT