diff --git a/Main.hs b/Main.hs
--- a/Main.hs
+++ b/Main.hs
@@ -79,6 +79,7 @@
 main :: IO ()
 main = getArgs >>= \args -> case args of
   [acct, f1, f2] -> diffCmd (T.pack acct) f1 f2
+  ["--version"] -> putStrLn "hledger-diff 0.2.0.9"  -- keep synced with hledger-diff.cabal
   _ -> do
     putStrLn "Usage: hledger-diff account:name left.journal right.journal"
     exitFailure
diff --git a/hledger-diff.cabal b/hledger-diff.cabal
--- a/hledger-diff.cabal
+++ b/hledger-diff.cabal
@@ -1,5 +1,5 @@
 name:                hledger-diff
-version:             0.2.0.9
+version:             0.2.0.10
 synopsis:            Compares the transactions in two ledger files.
 description:
   hledger-diff is a command-line utility to compare two journal files.  It