diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 # curl-runnings
 
-[![Build Status](https://travis-ci.org/aviaviavi/curl-runnings.svg?branch=master)](https://travis-ci.org/aviaviavi/curl-runnings) [![Hackage](https://img.shields.io/hackage/v/curl-runnings.svg)](https://hackage.haskell.org/package/curl-runnings)
+[![Build Status](https://travis-ci.org/aviaviavi/curl-runnings.svg?branch=master)](https://travis-ci.org/aviaviavi/curl-runnings) 
+[![Hackage](https://img.shields.io/hackage/v/curl-runnings.svg)](https://hackage.haskell.org/package/curl-runnings)
+[![Scarf](https://scarf.sh/package/badge/curl-runnings)](https://scarf.sh/package/avi/curl-runnings)
 
 _Feel the rhythm! Feel the rhyme! Get on up, it's testing time! curl-runnings!_
 
@@ -37,12 +39,17 @@
 
 ### Installing
 
-There are few options to install:
+The best way to install curl-runnings is with the [scarf](https://scarf.sh)
+package manager.
 
-- download the Linux or Mac built releases from the
-  github [releases page](https://github.com/aviaviavi/curl-runnings/releases)
-- install the binary with `stack` or `cabal`
-- build from source with `stack`
+```bash
+# If you don't have scarf, you can easily install it with:
+$ curl -L https://scarf.sh/install | bash
+ 
+$ scarf install curl-runnings
+```
+
+Alternatively, you can compile from source with stack.
 
 ### Writing a test specification
 
diff --git a/curl-runnings.cabal b/curl-runnings.cabal
--- a/curl-runnings.cabal
+++ b/curl-runnings.cabal
@@ -1,13 +1,13 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.31.1.
+-- This file has been generated from package.yaml by hpack version 0.31.2.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: b7f43a448b7bffd8bc3340f6483fb99f6391934bc869150ced8021708ca83864
+-- hash: c5eff7acb49843acbacdcf64e3e57fd05242eee41e466f2468cc9bf696b5f666
 
 name:           curl-runnings
-version:        0.11.0
+version:        0.11.1
 synopsis:       A framework for declaratively writing curl based API tests
 description:    Please see the README on Github at <https://github.com/aviaviavi/curl-runnings#readme>
 category:       Testing
diff --git a/src/Testing/CurlRunnings/Internal/Parser.hs b/src/Testing/CurlRunnings/Internal/Parser.hs
--- a/src/Testing/CurlRunnings/Internal/Parser.hs
+++ b/src/Testing/CurlRunnings/Internal/Parser.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE OverloadedStrings   #-}
+{-# LANGUAGE OverloadedStrings #-}
 
 -- | Internal module for parsing string based directives inside of curl runnings
 -- suites. Use this module at your own risk, it may change. Currently, string
@@ -48,7 +48,7 @@
   let trimmed = T.strip q
   in case Text.Megaparsec.parse parseFullTextWithQuery "" trimmed of
        Right a -> Right a >>= validateQuery
-       Left a -> Left $ QueryParseError (T.pack $ errorBundlePretty a) q
+       Left a  -> Left $ QueryParseError (T.pack $ errorBundlePretty a) q
 
 -- | Once we have parsed a query successfully, ensure that it is a legal query
 validateQuery :: [InterpolatedQuery] -> Either QueryError [InterpolatedQuery]
@@ -121,7 +121,7 @@
   notFollowedBy endingChars
   (lexeme . try) ((KeyIndex . T.pack) <$> p)
   where
-    p = (:) <$> letterChar <*> many (noneOf ['.', '[', ']', '<', '>', ' ', '{', '}'])
+    p = (:) <$> (letterChar <|> (char '_')) <*> many (noneOf ['.', '[', ']', '<', '>', ' ', '{', '}'])
 
 jsonIndexParser :: Parser Query
 jsonIndexParser =
diff --git a/src/Testing/CurlRunnings/Types.hs b/src/Testing/CurlRunnings/Types.hs
--- a/src/Testing/CurlRunnings/Types.hs
+++ b/src/Testing/CurlRunnings/Types.hs
@@ -361,7 +361,7 @@
     T.unpack $ makeRed "[FAIL] " <>
     name c <>
     "\n" <>
-    mconcat (map ((\s -> "\nAssertion failed: " <> s) . (<> "\n") . pShow) failures)
+    mconcat (map ((\s -> "\nAssertion failed: " <> s) . (<> "\n") . (T.pack . show)) failures)
 
 -- | A wrapper type around a set of test cases. This is the top level spec type
 -- that we parse a test spec file into
diff --git a/test/Spec.hs b/test/Spec.hs
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -27,6 +27,7 @@
     parseQuery "just some text" `shouldSatisfy` isRight
     parseQuery "$<RESPONSES[0].key.key>" `shouldSatisfy` isRight
     parseQuery "$<RESPONSES[0].key.key[0].key_with_underscores>" `shouldSatisfy` isRight
+    parseQuery "$<RESPONSES[0].key.key[0]._key_starts_with_underscores>" `shouldSatisfy` isRight
     parseQuery "$<RESPONSES[100].key.key[0].key_with_underscores>" `shouldSatisfy` isRight
     parseQuery "some text before $<RESPONSES[100].key.key[0].key_with_underscores> and after" `shouldSatisfy` isRight
     parseQuery "some $<RESPONSES[100]> querires $<RESPONSES[100]>" `shouldSatisfy` isRight