diff --git a/friday-devil.cabal b/friday-devil.cabal
--- a/friday-devil.cabal
+++ b/friday-devil.cabal
@@ -2,7 +2,7 @@
 --                      +-+------- breaking API changes
 --                      | | +----- non-breaking API additions
 --                      | | | +--- code changes with no API change
-version:                0.1.1.0
+version:                0.1.1.1
 synopsis:               Uses the DevIL C library to read and write images from
                         and to files and memory buffers.
 homepage:               https://github.com/RaphaelJ/friday-devil
diff --git a/src/Vision/Image/Storage/DevIL.hsc b/src/Vision/Image/Storage/DevIL.hsc
--- a/src/Vision/Image/Storage/DevIL.hsc
+++ b/src/Vision/Image/Storage/DevIL.hsc
@@ -84,10 +84,6 @@
 
 -- Instances -------------------------------------------------------------------
 
-instance Convertible StorageImage StorageImage where
-    safeConvert = Right
-    {-# INLINE safeConvert #-}
-
 instance Convertible Grey StorageImage where
     safeConvert = Right . GreyStorage
     {-# INLINE safeConvert #-}
@@ -100,6 +96,7 @@
     safeConvert = Right . RGBStorage
     {-# INLINE safeConvert #-}
 
+-- | Note: Convertible StorageImage StorageImage is provided by this instance.
 instance (Convertible Grey i, Convertible RGB i, Convertible RGBA i)
     => Convertible StorageImage i where
     safeConvert (GreyStorage img) = Right $ convert img