diff --git a/.env.example b/.env.example
index 172092ac..b2d6b98e 100644
--- a/.env.example
+++ b/.env.example
@@ -7,3 +7,5 @@ NITRO_TESTNODE_L2_TOKEN_BRIDGE_DEPLOYER_PRIVATE_KEY=0xb6b15c8cb491557369f3c7d2c2
 
 NITRO_TESTNODE_L3_ROLLUP_OWNER_PRIVATE_KEY=0xecdf21cb41c65afb51f91df408b7656e2c8739a5877f2814add0afd780cc210e
 NITRO_TESTNODE_L3_TOKEN_BRIDGE_DEPLOYER_PRIVATE_KEY=0xadd3d9301e184194943ce6244aa25c90e73c5843db16a994d202091f97f5bb27
+
+PRIVATE_RPC_ENDPOINT(optional)=