diff --git a/EIPS/eip-170.md b/EIPS/eip-170.md
index ff983404..4dfa169e 100644
--- a/EIPS/eip-170.md
+++ b/EIPS/eip-170.md
@@ -12,7 +12,7 @@ Created: 2016-11-04
 
 ### Parameters
 - `FORK_BLKNUM`: 2,675,000
-- `CHAIN_ID`: 1
+- `CHAIN_ID`: 1 (main net)
 
 ### Specification