diff --git a/NEWS.md b/NEWS.md
index e20f62d146e48..d6ecbf2762e14 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -17,7 +17,9 @@ Language changes
 * `mod(x::AbstractFloat, -Inf)` now returns `x` (as long as `x` is finite), this aligns with C standard and
 is considered a bug fix ([#47102])
 
-  - The `hash` algorithm and its values have changed. Most `hash` specializations will remain correct and require no action. Types that reimplement the core hashing logic independently, such as some third-party string packages do, may require a migration to the new algorithm. ([#57509])
+* The `hash` algorithm and its values have changed for certain types, most notably AbstractString. Any `hash` specializations for equal types to those that changed, such as some third-party string packages, may need to be deleted. ([#57509], [#59691])
+
+* The `hash(::AbstractString)` function is now a zero-copy / zero-cost function, based upon providing a correct implementation of the `codeunit` and `iterate` functions. Third-party string packages should migrate to the new algorithm by deleting their existing overrides of the `hash` function. ([#59691])
 
 * Indexless `getindex` and `setindex!` (i.e. `A[]`) on `ReinterpretArray` now correctly throw a `BoundsError` when there is more than one element. ([#58814])
 
diff --git a/base/hashing.jl b/base/hashing.jl
index 56c8c5c3b9e0f..2556c9265dbb4 100644
--- a/base/hashing.jl
+++ b/base/hashing.jl
@@ -629,7 +629,3 @@ hash(data::AbstractString, h::UInt) =
     hash_bytes(utf8units(data), UInt64(h), HASH_SECRET) % UInt
 @assume_effects :total hash(data::String, h::UInt) =
     GC.@preserve data hash_bytes(pointer(data), sizeof(data), UInt64(h), HASH_SECRET) % UInt
-
-# no longer used in Base, but a lot of packages access these internals
-const memhash = UInt === UInt64 ? :memhash_seed : :memhash32_seed
-const memhash_seed = UInt === UInt64 ? 0x71e729fd56419c81 : 0x56419c81