From baaaf59fe5a577aac6b9fe573fcbdef6ce5f924a Mon Sep 17 00:00:00 2001
From: Paul Hauner <paul@paulhauner.com>
Date: Tue, 3 Sep 2019 11:49:26 +1000
Subject: [PATCH] Add message about --spec flag to book

---
 book/src/interop-scenarios.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/book/src/interop-scenarios.md b/book/src/interop-scenarios.md
index d54772ee8c..dc87893622 100644
--- a/book/src/interop-scenarios.md
+++ b/book/src/interop-scenarios.md
@@ -58,6 +58,7 @@ $ ./beacon_node testnet --spec minimal -f file ssz /tmp/genesis.ssz
 > - The `-f` flag ignores any existing database or configuration, backing them
 >   up before re-initializing.
 > - See `$ ./beacon_node testnet file --help` for more configuration options.
+> - The `--spec` flag is required to allow SSZ parsing of fixed-length lists.
 
 <a name="val-client"></a>
 ### Start an auto-configured validator client