diff --git a/pipes.cabal b/pipes.cabal
--- a/pipes.cabal
+++ b/pipes.cabal
@@ -1,5 +1,5 @@
 Name: pipes
-Version: 4.3.10
+Version: 4.3.11
 Cabal-Version: >= 1.10
 Build-Type: Simple
 Tested-With: GHC == 7.10.3, GHC == 8.0.2, GHC == 8.2.2, GHC == 8.4.4, GHC == 8.6.5, GHC == 8.8.1
diff --git a/src/Pipes/Prelude.hs b/src/Pipes/Prelude.hs
--- a/src/Pipes/Prelude.hs
+++ b/src/Pipes/Prelude.hs
@@ -536,7 +536,7 @@
 
 {-| Strict, monadic left scan
 
-> Control.Foldl.impurely scan :: Monad m => FoldM a m b -> Pipe a b m r
+> Control.Foldl.impurely scanM :: Monad m => FoldM m a b -> Pipe a b m r
 -}
 scanM :: Monad m => (x -> a -> m x) -> m x -> (x -> m b) -> Pipe a b m r
 scanM step begin done = do