diff --git a/Main.hs b/Main.hs
--- a/Main.hs
+++ b/Main.hs
@@ -56,7 +56,7 @@
           (O.fullDesc 
             <> O.progDesc [s| Transform JSON objects to TSV.  
                     On STDIN provide an input stream of whitespace-separated JSON objects. |]
-            <> O.header "jsontsv v0.1.4.3"
+            <> O.header "jsontsv"
             <> O.footer "See https://github.com/danchoi/jsontsv for more information.")
 
 main = do
@@ -122,7 +122,7 @@
 pAlias :: AT.Parser (Maybe Text)
 pAlias = do
     AT.char ':'
-    Just <$> AT.takeWhile1 (AT.inClass "a-zA-Z0-9")
+    Just <$> AT.takeWhile1 (AT.inClass "a-zA-Z0-9_-")
 
 pKeyOrIndex :: AT.Parser Key
 pKeyOrIndex = pIndex <|> pKey
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -97,7 +97,7 @@
 ## Usage
 
 ```
-jsontsv v0.1.4.3
+jsontsv 
 
 Usage: jsontsv FIELDS [-a DELIM] ([-c|--csv] | [-d DELIM]) [-H] [--debug]
   Transform JSON objects to TSV. On STDIN provide an input stream of
diff --git a/jsontsv.cabal b/jsontsv.cabal
--- a/jsontsv.cabal
+++ b/jsontsv.cabal
@@ -2,7 +2,7 @@
 --  see http://haskell.org/cabal/users-guide/
 
 name:                jsontsv
-version:             0.1.4.3
+version:             0.1.4.4
 synopsis:            JSON to TSV transformer
 homepage:            https://github.com/danchoi/jsontsv
 description:         Transforms JSON into tab-separated line-oriented output, for easier processing in Unix-style pipelines.