diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index dfb7fbdb6..655775d22 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -569,7 +569,7 @@ def int_to_bytes(n: uint64, length: uint64) -> bytes:
 ```python
 def bytes_to_int(data: bytes) -> uint64:
     """
-    Return the integer deserialization of ``data`` intepretted as ``ENDIANNESS``-endian.
+    Return the integer deserialization of ``data`` intepreted as ``ENDIANNESS``-endian.
     """
     return int.from_bytes(data, ENDIANNESS)
 ```