diff --git a/EIPS/eip-155.md b/EIPS/eip-155.md
index 1e18adbe..849fa132 100644
--- a/EIPS/eip-155.md
+++ b/EIPS/eip-155.md
@@ -14,7 +14,7 @@ Created: 2016-10-14
 
 ### Parameters
 - `FORK_BLKNUM`: 2,675,000
-- `CHAIN_ID`: 1
+- `CHAIN_ID`: 1 (main net)
 ### Specification
 
 If `block.number >= FORK_BLKNUM` and `v = CHAIN_ID * 2 + 35` or `v = CHAIN_ID * 2 + 36`, then when computing the hash of a transaction for purposes of signing or recovering, instead of hashing only the first six elements (i.e. nonce, gasprice, startgas, to, value, data), hash nine elements, with `v` replaced by `CHAIN_ID`, `r = 0` and `s = 0`. The currently existing signature scheme using `v = 27` and `v = 28` remains valid and continues to operate under the same rules as it does now.