diff --git a/specs/phase0/beacon-chain.md b/specs/phase0/beacon-chain.md
index df3661810..ba701c2b1 100644
--- a/specs/phase0/beacon-chain.md
+++ b/specs/phase0/beacon-chain.md
@@ -578,7 +578,7 @@ def xor(bytes_1: Bytes32, bytes_2: Bytes32) -> Bytes32:
 
 #### `uint_to_bytes`
 
-`def uint_to_bytes(n: uint8) -> bytes` is a function for serializing the `uint` type object to bytes in ``ENDIANNESS``-endian. The expected length of the output is the byte-length of the `uint` type.
+`def uint_to_bytes(n: uint) -> bytes` is a function for serializing the `uint` type object to bytes in ``ENDIANNESS``-endian. The expected length of the output is the byte-length of the `uint` type.
 
 #### `bytes_to_uint64`