diff --git a/src/Data/Record.hs b/src/Data/Record.hs
index d0f2e3b21..0fe74b1b1 100644
--- a/src/Data/Record.hs
+++ b/src/Data/Record.hs
@@ -24,6 +24,7 @@ field = Tagged
 
 -- Classes
 
+-- | HasField enables indexing a Record by (phantom) type tags.
 class HasField (fields :: [*]) (field :: *) where
   getField :: Record fields -> field