Adjust docs

nix/upstreamable/default.nix

@@ -79,9 +79,7 @@ let
   /* Function to derivation of the docker compose yaml file
      NOTE: The output will change: https://github.com/hercules-ci/arion/issues/82
 
-    This function is particularly useful on CI. On Nixpkgs >= 20.09 this will
-    not store the image tarballs but executables to produce them reliably via
-    streamLayeredImage.
+     This function is particularly useful on CI.
    */
   build = args@{...}:
     let composition = eval args;

src/haskell/exe/Main.hs

@@ -60,7 +60,7 @@ parseOptions = do
           <> help "Use Nix expression EXPR to get the Nixpkgs attrset used for bootstrapping \
                    \and evaluating the configuration." )
     showTrace <- flag False True (long "show-trace"
-                    <> help "Causes Nix to print out a stack trace in case of Nix expression evaluation errors.")
+                    <> help "Causes Nix to print out a stack trace in case of Nix expression evaluation errors. Specify before command.")
     -- TODO --option support (https://github.com/pcapriotti/optparse-applicative/issues/284)
     userNixArgs <- many (T.pack <$> strOption (long "nix-arg" <> metavar "ARG" <> help "Pass an extra argument to nix. Example: --nix-arg --option --nix-arg substitute --nix-arg false"))
     prebuiltComposeFile <- optional $ strOption