diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..1cea4f29b4afa28d5ae72c7f9b1e51a3418d7363
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+cabal.project.local
+.direnv
+.pre-commit-config.yaml
+*~
diff --git a/src/Tahoe/SDMF/Internal/Capability.hs b/src/Tahoe/SDMF/Internal/Capability.hs
index 0e6249bc2d6a5ab1440d1e2ff68e9426b967a620..a0a194347d4f42dd944eef0d580c5f6f9d31dd63 100644
--- a/src/Tahoe/SDMF/Internal/Capability.hs
+++ b/src/Tahoe/SDMF/Internal/Capability.hs
@@ -53,6 +53,9 @@ data Verifier = Verifier
     }
     deriving (Eq, Show)
 
+instance Ord Verifier where
+    a <= b = verifierStorageIndex a <= verifierStorageIndex b
+
 instance ConfidentialShowable Verifier where
     confidentiallyShow = dangerRealShow . SDMFVerifier
 
@@ -63,6 +66,9 @@ data Reader = Reader
     }
     deriving (Eq, Show)
 
+instance Ord Reader where
+    a <= b = readerVerifier a <= readerVerifier b
+
 instance ConfidentialShowable Reader where
     confidentiallyShow = dangerRealShow . SDMFReader
 
@@ -73,6 +79,9 @@ data Writer = Writer
     }
     deriving (Eq, Show)
 
+instance Ord Writer where
+    a <= b = writerReader a <= writerReader b
+
 instance ConfidentialShowable Writer where
     confidentiallyShow = dangerRealShow . SDMFWriter
 
diff --git a/src/Tahoe/SDMF/Internal/Keys.hs b/src/Tahoe/SDMF/Internal/Keys.hs
index fbe3068211e516a502c7c6f0708ad9130ad2de79..db8d71dddd8e428c8b85cfeaf5ec018bbbc6cc94 100644
--- a/src/Tahoe/SDMF/Internal/Keys.hs
+++ b/src/Tahoe/SDMF/Internal/Keys.hs
@@ -86,7 +86,7 @@ instance Binary Read where
         let (CryptoPassed unRead) = cipherInit readKeyBytes
         pure Read{..}
 
-newtype StorageIndex = StorageIndex {unStorageIndex :: B.ByteString} deriving newtype (Eq)
+newtype StorageIndex = StorageIndex {unStorageIndex :: B.ByteString} deriving newtype (Eq, Ord)
 
 instance Show StorageIndex where
     show (StorageIndex si) =
diff --git a/tahoe-ssk.cabal b/tahoe-ssk.cabal
index 380aeb6b7b7ed3a40dd74448def01014ceb33514..680c2a2c100e91d0819f393a2b31958f4b47ae81 100644
--- a/tahoe-ssk.cabal
+++ b/tahoe-ssk.cabal
@@ -21,7 +21,7 @@ name:               tahoe-ssk
 -- PVP summary:     +-+------- breaking API changes
 --                  | | +----- non-breaking API additions
 --                  | | | +--- code changes with no API change
-version:            0.2.0.0
+version:            0.2.1.0
 
 -- A short (one-line) description of the package.
 synopsis: