diff --git a/ChangeLog.md b/ChangeLog.md
new file mode 100644
--- /dev/null
+++ b/ChangeLog.md
@@ -0,0 +1,17 @@
+HEAD
+====
+
+0.2.1.0
+=======
+
+- Add a `MonadFail` instance to `HaskelineT`.
+
+0.2.0.0
+=======
+
+- `evalRepl` has changed signature.
+
+0.1.0.0
+=======
+
+- Initial release.
diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2016-2017 Stephen Diehl
+Copyright (c) 2016-2019 Stephen Diehl
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@
 ini = liftIO $ putStrLn "Welcome!"
 
 repl :: IO ()
-repl = evalRepl (pure ">>> ") cmd options (Word completer) ini
+repl = evalRepl (pure ">>> ") cmd options Nothing (Word completer) ini
 ```
 
 Trying it out:
@@ -113,7 +113,7 @@
 -- Tab completion inside of StateT
 repl :: IO ()
 repl = flip evalStateT Set.empty
-     $ evalRepl (pure ">>> ") cmd opts (Word comp) init
+     $ evalRepl (pure ">>> ") cmd opts Nothing (Word comp) init
 ```
 
 
@@ -164,7 +164,7 @@
 init = return ()
 
 repl :: IO ()
-repl = evalRepl (pure ">>> ") cmd opts (Prefix (wordCompleter byWord) defaultMatcher) init
+repl = evalRepl (pure ">>> ") cmd opts Nothing (Prefix (wordCompleter byWord) defaultMatcher) init
 ```
 
 Trying it out:
@@ -180,15 +180,8 @@
 christmas thanksgiving festivus
 ```
 
-Installation
-------------
-
-```bash
-$ cabal install repline
-```
-
 License
 -------
 
-Copyright (c) 2014-2017, Stephen Diehl
+Copyright (c) 2014-2019, Stephen Diehl
 Released under the MIT License
diff --git a/repline.cabal b/repline.cabal
--- a/repline.cabal
+++ b/repline.cabal
@@ -1,22 +1,26 @@
 name:                repline
-version:             0.2.0.0
+version:             0.2.1.0
 synopsis:            Haskeline wrapper for GHCi-like REPL interfaces.
 license:             MIT
 license-file:        LICENSE
 author:              Stephen Diehl
 maintainer:          stephen.m.diehl@gmail.com
-copyright:           2014-2017 Stephen Diehl
+copyright:           2014-2019 Stephen Diehl
 category:            User Interfaces
 build-type:          Simple
 extra-source-files:  README.md
 cabal-version:       >=1.10
 tested-with:         GHC == 7.6.1, GHC == 7.6.3, GHC == 7.8.3, GHC == 7.10.1
 homepage:            https://github.com/sdiehl/repline
-Bug-Reports:         https://github.com/sdiehl/repline/issues
+bug-Reports:         https://github.com/sdiehl/repline/issues
 
-Description:
+description:
   Haskeline wrapper for GHCi-like REPL interfaces. Composable with normal mtl transformers.
 
+extra-source-files:
+  README.md
+  ChangeLog.md
+
 Source-Repository head
     Type: git
     Location: git@github.com:sdiehl/repline.git
@@ -27,6 +31,7 @@
   build-depends:
     base       >= 4.6 && <5.0,
     containers >= 0.5 && <0.7,
+    fail       >= 4.9 && <4.10,
     mtl        >= 2.2 && <2.3,
     process    >= 1.2 && <2.0,
     haskeline  >= 0.7 && <0.8
diff --git a/src/System/Console/Repline.hs b/src/System/Console/Repline.hs
--- a/src/System/Console/Repline.hs
+++ b/src/System/Console/Repline.hs
@@ -21,8 +21,10 @@
 
   * Completions: Handled when tab key is pressed.
 
-  * Options: Handled when a command prefixed by a colon is entered.
+  * Options: Handled when a command prefixed by a prefix character is entered.
 
+  * Command prefix character: Optional command prefix ( passing Nothing ignores the Options argument ).
+
   * Banner: Text Displayed at initialization.
 
   * Initializer: Run at initialization.
@@ -72,7 +74,7 @@
 Putting it all together we have a little shell.
 
 > main :: IO ()
-> main = evalRepl (pure ">>> ") cmd options (Word completer) ini
+> main = evalRepl (pure ">>> ") cmd options (Just ':') (Word completer) ini
 
 Putting this in a file we can test out our cow-trek shell.
 
@@ -134,6 +136,7 @@
 
 import Data.List (isPrefixOf)
 import Control.Applicative
+import Control.Monad.Fail as Fail
 import Control.Monad.State.Strict
 import Control.Monad.Reader
 
@@ -158,6 +161,9 @@
   getInputChar = H.getInputChar
   outputStr    = H.outputStr
   outputStrLn  = H.outputStrLn
+
+instance Fail.MonadFail m => Fail.MonadFail (HaskelineT m) where
+  fail = lift . Fail.fail
 
 instance MonadState s m => MonadState s (HaskelineT m) where
   get = lift get