GHCi :doc command doesn't work in ghc-9.4-alpha1

~ $ ghci-9.4
GHCi, version 9.4.0.20220501: https://www.haskell.org/ghc/  :? for help
ghci> import Data.Map
ghci> :doc insert
Can't find any documentation for Data.Map.Internal.
Try re-compiling with '-haddock'.
ghci> :doc head
Can't find any documentation for GHC.List.
Try re-compiling with '-haddock'.

Method of installation:

Via GHCup according to these instructions. The URL of the tarball is https://downloads.haskell.org/ghc/9.4.1-alpha1/ghc-9.4.0.20220501-x86_64-deb11-linux.tar.xz.

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