diff --git a/site.hs b/site.hs
index 800c37e..985ce23 100644
--- a/site.hs
+++ b/site.hs
@@ -82,6 +82,7 @@ pageTemplates = do
   nub . ([rt, tt] ++) <$>
     (gets (^.. pages . traverse) >>= traverse pageTemplate)
 
+-- | Compile a single template in a directory
 compileTemplate ::
      FilePath
   -> FilePath
@@ -127,6 +128,7 @@ processLink base l = do
 pageFilename :: FilePath -> Site FilePath
 pageFilename p = indexFilename $ "page" </> p
 
+-- | Like `Mu.substitute` but writes and throws stuff on errors
 checkedSubstitute :: Mu.Template -> Y.Value -> IO T.Text
 checkedSubstitute t v = do
   let (es, txt) = Mu.checkedSubstitute t v
@@ -161,7 +163,8 @@ installRedirect target from = do
   io $ do
     putStrLn $ "@ -> " ++ file ++ " -> " ++ target
     makeDirectories file
-    txt <- checkedSubstitute templ $ Y.object [("target", Y.String $ T.pack target)]
+    txt <-
+      checkedSubstitute templ $ Y.object [("target", Y.String $ T.pack target)]
     TIO.writeFile file txt
 
 -- | Install all redirects required by one page.