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diff --git a/cλash/CLasH/Normalize.hs b/cλash/CLasH/Normalize.hs
index ea1051694f52c405e3fd1d965b578a082389ec27..4743824bf2ba85313b3bb4bf1241f00e0f47e2d2 100644 (file)
--- a/cλash/CLasH/Normalize.hs
+++ b/cλash/CLasH/Normalize.hs
@@ -620,6 +620,9 @@ argprop expr@(App _ _) | is_var fexpr = do
         else do
           -- Representable types will not be propagated, and arguments with free
           -- type variables will be propagated later.
+          -- Note that we implicitly remove any type variables in the type of
+          -- the original argument by using the type of the actual argument
+          -- for the new formal parameter.
           -- TODO: preserve original naming?
           id <- Trans.lift $ mkBinderFor arg "param"
           -- Just pass the original argument to the new function, which binds it