diff --git a/edges.cabal b/edges.cabal
--- a/edges.cabal
+++ b/edges.cabal
@@ -1,7 +1,7 @@
 name:
   edges
 version:
-  0.8
+  0.8.1
 category:
   Graphs
 synopsis:
diff --git a/library/Edges/Instances.hs b/library/Edges/Instances.hs
--- a/library/Edges/Instances.hs
+++ b/library/Edges/Instances.hs
@@ -15,3 +15,4 @@
 instance Show (Node a) where show (Node int) = show int
 instance Show (NodeCounts a) where show = show . nodeCountsList
 deriving instance Show (Edges a b)
+deriving instance Show (Amount a)