diff --git a/README.md b/README.md
index 2af4b45..637e59e 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,8 @@
 ## How to build ##
 
 First install Buildroot's required dependencies. See:
-[The buildroot user manual, chapter 2: System requirements](https://buildroot.org/downloads/manual/manual.html#requirement)
+[The buildroot user manual, chapter 2: System requirements](https://buildroot.org/downloads/manual/manual.html#requirement).
+Also install openocd, it is required for the flashing script (see below).
 
 Then set up the required source code: