diff --git a/Language/Haskell/GhcMod/CabalApi.hs b/Language/Haskell/GhcMod/CabalApi.hs
index 7ac7a46..58d7512 100644
--- a/Language/Haskell/GhcMod/CabalApi.hs
+++ b/Language/Haskell/GhcMod/CabalApi.hs
@@ -155,6 +155,7 @@ getGHC :: IO Version
 getGHC = do
     mv <- programFindVersion ghcProgram silent (programName ghcProgram)
     case mv of
+      -- TODO: MonadError it up
         Nothing -> E.throwIO $ userError "ghc not found"
         Just v  -> return v