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-rw-r--r--users/grfn/xanthous/src/Xanthous/Util.hs8
1 files changed, 8 insertions, 0 deletions
diff --git a/users/grfn/xanthous/src/Xanthous/Util.hs b/users/grfn/xanthous/src/Xanthous/Util.hs
index 2f9606b29c..6678cffe6a 100644
--- a/users/grfn/xanthous/src/Xanthous/Util.hs
+++ b/users/grfn/xanthous/src/Xanthous/Util.hs
@@ -80,6 +80,14 @@ foldlMapM' f xs = foldr f' pure xs mempty
     let !b = mappend bl br
     k b
 
+-- | Returns whether the third argument is in the range given by the first two
+-- arguments, inclusive
+--
+-- >>> between (0 :: Int) 2 2
+-- True
+--
+-- >>> between (0 :: Int) 2 3
+-- False
 between
   :: Ord a
   => a -- ^ lower bound