From 34e60899c0b684d753613e6e529190ad989dc711 Mon Sep 17 00:00:00 2001
From: Pavol Rusnak <stick@gk2.sk>
Date: Fri, 2 Mar 2018 16:36:19 +0100
Subject: [PATCH] docs: add info about git submodule update

---
 docs/build.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docs/build.md b/docs/build.md
index 39ab6780c7..45cbfdf92f 100644
--- a/docs/build.md
+++ b/docs/build.md
@@ -9,6 +9,12 @@ git clone --recursive https://github.com/trezor/trezor-core.git
 cd trezor-core
 ```
 
+If are building the already cloned the project, don't forget to use the following to refresh the submodules:
+
+```sh
+git submodule update --init --recursive
+```
+
 ### Linux
 
 #### Debian/Ubuntu