diff --git a/README.md b/README.md
index 381b15065..ce01458fa 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,10 @@ An open-source Ethereum 2.0 client, written in Rust and maintained by Sigma Prim
 
 ![Banner](https://i.postimg.cc/hjdTGKPd/photo-2020-10-23-09-52-16.jpg)
 
+**🚨🚨🚨 Note: Lighthouse is not *yet* ready to produce mainnet deposits. The developers will require some
+time to test against the mainnet deposit contract, once it is released. DO NOT SUBMIT VALIDATOR
+DEPOSITS WITH LIGHTHOUSE. 🚨🚨🚨**
+
 ## Overview
 
 Lighthouse is:
@@ -30,6 +34,12 @@ Lighthouse is:
 
 Like all Ethereum 2.0 clients, Lighthouse is a work-in-progress.
 
+## Eth2 Deposit Contract
+
+The Lighthouse team acknowledges
+[`0x00000000219ab540356cBB839Cbe05303d7705Fa`](https://etherscan.io/address/0x00000000219ab540356cbb839cbe05303d7705fa)
+as the canonical Eth2 deposit contract address.
+
 ## Development Status
 
 Current development overview:
diff --git a/account_manager/src/validator/create.rs b/account_manager/src/validator/create.rs
index a779a2881..51d466264 100644
--- a/account_manager/src/validator/create.rs
+++ b/account_manager/src/validator/create.rs
@@ -25,6 +25,8 @@ pub const STORE_WITHDRAW_FLAG: &str = "store-withdrawal-keystore";
 pub const COUNT_FLAG: &str = "count";
 pub const AT_MOST_FLAG: &str = "at-most";
 pub const WALLET_PASSWORD_PROMPT: &str = "Enter your wallet's password:";
+pub const MAINNET_WARNING: &str = "These are *not* mainnet validators! Submitting a mainnet \
+                                    deposit for this validator will result in lost ETH.";
 
 pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
     App::new(CMD)
@@ -229,6 +231,8 @@ pub fn cli_run<T: EthSpec>(
             .map_err(|e| format!("Unable to build validator directory: {:?}", e))?;
 
         println!("{}/{}\t{}", i + 1, n, voting_pubkey.to_hex_string());
+
+        println!("{}", MAINNET_WARNING);
     }
 
     Ok(())
diff --git a/book/src/intro.md b/book/src/intro.md
index f5f8b1b66..22fa48adb 100644
--- a/book/src/intro.md
+++ b/book/src/intro.md
@@ -13,6 +13,10 @@ clients to form a resilient and decentralized proof-of-stake blockchain.
 We implement the specification as defined in the
 [ethereum/eth2.0-specs](https://github.com/ethereum/eth2.0-specs) repository.
 
+**🚨🚨🚨 Note: Lighthouse is not *yet* ready to produce mainnet deposits. The developers will require some
+time to test against the mainnet deposit contract, once it is released. DO NOT SUBMIT VALIDATOR
+DEPOSITS WITH LIGHTHOUSE. 🚨🚨🚨**
+
 ## Topics
 
 You may read this book from start to finish, or jump to some of these topics:
diff --git a/book/src/testnet-validator.md b/book/src/testnet-validator.md
index 3422a0a11..58e2912e1 100644
--- a/book/src/testnet-validator.md
+++ b/book/src/testnet-validator.md
@@ -3,6 +3,10 @@
 Joining an Eth2 testnet is a great way to get familiar with staking in Phase 0.
 All users should experiment with a testnet prior to staking mainnet ETH.
 
+**🚨🚨🚨 Note: Lighthouse is not *yet* ready to produce mainnet deposits. The developers will require some
+time to test against the mainnet deposit contract, once it is released. DO NOT SUBMIT VALIDATOR
+DEPOSITS WITH LIGHTHOUSE. 🚨🚨🚨**
+
 ## Supported Testnets
 
 Lighthouse supports four testnets:
diff --git a/book/src/validator-create.md b/book/src/validator-create.md
index 101056140..995c20065 100644
--- a/book/src/validator-create.md
+++ b/book/src/validator-create.md
@@ -1,5 +1,9 @@
 # Create a validator
 
+**🚨🚨🚨 Note: Lighthouse is not *yet* ready to produce mainnet deposits. The developers will require some
+time to test against the mainnet deposit contract, once it is released. DO NOT SUBMIT VALIDATOR
+DEPOSITS WITH LIGHTHOUSE. 🚨🚨🚨**
+
 Validators are fundamentally represented by a BLS keypair. In Lighthouse, we
 use a [wallet](./wallet-create.md) to generate these keypairs. Once a wallet
 exists, the `lighthouse account validator create` command is used to generate
diff --git a/lighthouse/tests/account_manager.rs b/lighthouse/tests/account_manager.rs
index 4ce7bb8ac..d64dbb977 100644
--- a/lighthouse/tests/account_manager.rs
+++ b/lighthouse/tests/account_manager.rs
@@ -283,10 +283,14 @@ impl TestValidator {
 
         let pubkeys = stdout[..stdout.len() - 1]
             .split("\n")
-            .map(|line| {
-                let tab = line.find("\t").expect("line must have tab");
-                let (_, pubkey) = line.split_at(tab + 1);
-                pubkey.to_string()
+            .filter_map(|line| {
+                if line.starts_with(MAINNET_WARNING) {
+                    None
+                } else {
+                    let tab = line.find("\t").expect("line must have tab");
+                    let (_, pubkey) = line.split_at(tab + 1);
+                    Some(pubkey.to_string())
+                }
             })
             .collect::<Vec<_>>();