diff --git a/crates/common/rlp-derive/README.md b/crates/common/rlp-derive/README.md
index d7badd4daa..a105019ab6 100644
--- a/crates/common/rlp-derive/README.md
+++ b/crates/common/rlp-derive/README.md
@@ -1,3 +1,4 @@
 ## RLP derive crate
 
-Forked from an earlier Apache licenced version of the `fastrlp-derive` crate, before it changed licence to GPL. 
\ No newline at end of file
+Forked from an earlier Apache licenced version of the `fastrlp-derive` crate, before it changed licence to GPL.
+NOTE: The Rust fastrlp implementation is itself a port of the [Golang Apache licensed fastrlp](https://github.com/umbracle/fastrlp)
diff --git a/crates/common/rlp/README.md b/crates/common/rlp/README.md
index 18b056723b..0fda03ed21 100644
--- a/crates/common/rlp/README.md
+++ b/crates/common/rlp/README.md
@@ -1,3 +1,4 @@
 ## RLP encoder/decoder
 
-Forked from an earlier Apache licenced version of the `fastrlp` crate, before it changed licence to GPL. 
\ No newline at end of file
+Forked from an earlier Apache licenced version of the `fastrlp` crate, before it changed licence to GPL.
+NOTE: The Rust fastrlp implementation is itself a port of the [Golang Apache licensed fastrlp](https://github.com/umbracle/fastrlp)
\ No newline at end of file
diff --git a/crates/libmdbx-rs/README.md b/crates/libmdbx-rs/README.md
index 8025411cb3..16436ddadc 100644
--- a/crates/libmdbx-rs/README.md
+++ b/crates/libmdbx-rs/README.md
@@ -1,7 +1,11 @@
 # libmdbx-rs
 
+
 Rust bindings for [libmdbx](https://libmdbx.dqdkfa.ru).
 
+Forked from an earlier Apache licenced version of the `libmdbx-rs` crate, before it changed licence to GPL.
+NOTE: Most of the repo came from lmdb-rs bindings: https://github.com/mozilla/lmdb-rs.
+
 ## Updating the libmdbx Version
 
 To update the libmdbx version you must clone it and copy the `dist/` folder in `mdbx-sys/`.
diff --git a/crates/primitives/src/forkid.rs b/crates/primitives/src/forkid.rs
index 5a11de1045..68e6853543 100644
--- a/crates/primitives/src/forkid.rs
+++ b/crates/primitives/src/forkid.rs
@@ -1,4 +1,5 @@
 //! EIP-2124 implementation based on <https://eips.ethereum.org/EIPS/eip-2124>.
+//! Previously version of apache licenced: https://crates.io/crates/ethereum-forkid
 
 #![deny(missing_docs)]
 #![allow(clippy::redundant_else, clippy::too_many_lines)]