diff --git a/src/Niv/Cli.hs b/src/Niv/Cli.hs
index 3af3b84..fc509b1 100644
--- a/src/Niv/Cli.hs
+++ b/src/Niv/Cli.hs
@@ -31,7 +31,6 @@ import qualified Data.ByteString.Lazy as L
 import qualified Data.HashMap.Strict as HMS
 import qualified Data.Text as T
 import qualified Data.Text.IO as T
-import qualified GitHub as GH
 import qualified Options.Applicative as Opts
 import qualified Options.Applicative.Help.Pretty as Opts
 import qualified System.Directory as Dir
@@ -546,31 +545,6 @@ pathNixSourcesJson = "nix" </> "sources.json"
 initNixSourcesJsonContent :: B.ByteString
 initNixSourcesJsonContent = "{}"
 
--------------------------------------------------------------------------------
--- Warn
--------------------------------------------------------------------------------
-
-warnCouldNotFetchGitHubRepo :: GH.Error -> (String, String) -> IO ()
-warnCouldNotFetchGitHubRepo e (owner, repo) =
-    putStrLn $ unlines [ line1, line2, line3 ]
-  where
-    line1 = "WARNING: Could not read from GitHub repo: " <> owner <> "/" <> repo
-    line2 = [s|
-I assumed that your package was a GitHub repository. An error occurred while
-gathering information from the repository. Check whether your package was added
-correctly:
-
-  niv show
-
-If not, try re-adding it:
-
-  niv drop <package>
-  niv add <package-without-typo>
-
-Make sure the repository exists.
-|]
-    line3 = unwords [ "(Error was:", show e, ")" ]
-
 -------------------------------------------------------------------------------
 -- Abort
 -------------------------------------------------------------------------------
diff --git a/src/Niv/GitHub.hs b/src/Niv/GitHub.hs
index 78074b1..dab3ae0 100644
--- a/src/Niv/GitHub.hs
+++ b/src/Niv/GitHub.hs
@@ -1,6 +1,8 @@
 {-# LANGUAGE Arrows #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE ViewPatterns #-}
+{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE OverloadedStrings #-}
 
 module Niv.GitHub where
@@ -8,6 +10,7 @@ module Niv.GitHub where
 import Control.Arrow
 import Data.Bool
 import Data.Maybe
+import Data.String.QQ (s)
 import GHC.Exts (toList)
 import Niv.Update
 import qualified Data.Text as T
@@ -23,7 +26,9 @@ data GithubRepo = GithubRepo
 githubRepo :: T.Text -> T.Text -> IO GithubRepo
 githubRepo owner repo = fmap translate <$>
     GH.executeRequest' (GH.repositoryR (GH.N owner) (GH.N repo)) >>= \case
-      Left e -> error (show e)
+      Left e -> do
+        warnCouldNotFetchGitHubRepo e (owner, repo)
+        error (show e)
       Right x -> pure x
   where
     translate r = GithubRepo
@@ -32,6 +37,27 @@ githubRepo owner repo = fmap translate <$>
       , repoDefaultBranch = GH.repoDefaultBranch r
       }
 
+warnCouldNotFetchGitHubRepo :: GH.Error -> (T.Text, T.Text) -> IO ()
+warnCouldNotFetchGitHubRepo e (T.unpack -> owner, T.unpack -> repo) =
+    putStrLn $ unlines [ line1, line2, line3 ]
+  where
+    line1 = "WARNING: Could not read from GitHub repo: " <> owner <> "/" <> repo
+    line2 = [s|
+I assumed that your package was a GitHub repository. An error occurred while
+gathering information from the repository. Check whether your package was added
+correctly:
+
+  niv show
+
+If not, try re-adding it:
+
+  niv drop <package>
+  niv add <package-without-typo>
+
+Make sure the repository exists.
+|]
+    line3 = unwords [ "(Error was:", show e, ")" ]
+
 -- TODO: fetchers for:
 --  * npm
 --  * hackage
diff --git a/src/Niv/Update.hs b/src/Niv/Update.hs
index 1edb562..995a639 100644
--- a/src/Niv/Update.hs
+++ b/src/Niv/Update.hs
@@ -76,7 +76,6 @@ runUpdate (boxAttrs -> attrs) a = runUpdate' attrs a >>= feed
       UpdateNeedMore next -> next (()) >>= hndl
     hndl = \case
       UpdateSuccess f v -> (,v) <$> unboxAttrs f
-      -- TODO: fix this
       UpdateFailed e -> error $ "Update failed: " <> T.unpack (prettyFail e)
     prettyFail :: UpdateFailed -> T.Text
     prettyFail = \case