In Haddock, individual function arguments can be documented like this: f :: Int -- ^ The 'Int' argument -> Float -- ^ The 'Float' argument -> IO () -- ^ The return value Since a typeclass method is very much like a function, I assumed I could document individual arguments of methods the same way. For example: -- | Class representing a connection to a collection of bulbs. -- In the case of a LAN connection, this would be all bulbs on the LAN. -- In the case of a cloud connection, this would be all bulbs associated -- with the cloud account for a particular access token. class Connection t where -- | Retrieve information about some or all lights. Corresponds to -- <http://api.developer.lifx.com/docs/list-lights List Lights> endpoint. -- Beware that on a @LanConnection@, it takes time for lights to be -- discovered, so the list of lights will be empty immediately after -- the connection is created. listLights :: t -- ^ The connection. -> [Selector] -- ^ The lights to list. -> [InfoNeeded] -- ^ A hint about what information is desired -- in the results. This hint is used -- by @LanConnection@, but is ignored by -- @CloudConnection@. -> IO [LightInfo] However, when I generate documentation (using Haddock 2.17.2, via "stack haddock"), the text "A hint about what information is desired" doesn't appear anywhere in the generated documentation. Is there a way I can include this sort of per-argument documentation for my typeclass methods? Thanks, --Patrick