diff --git a/specs/sharding/beacon-chain.md b/specs/sharding/beacon-chain.md
index 67dd16e08..7adc5bb27 100644
--- a/specs/sharding/beacon-chain.md
+++ b/specs/sharding/beacon-chain.md
@@ -70,7 +70,7 @@ We define the following Python custom types for type hinting and readability:
 | Name | SSZ equivalent | Description |
 | - | - | - |
 | `Shard` | `uint64` | A shard number |
-| `BLSCommitment` | `bytes48` | A G1 curve point |
+| `BLSCommitment` | `Bytes48` | A G1 curve point |
 | `BLSPoint` | `uint256` | A number `x` in the range `0 <= x < MODULUS` |
 
 ## Constants