From 44baa3ba0b44450a0d20e324065f06fe1e34da9e Mon Sep 17 00:00:00 2001
From: Mateusz Jakub Fila <mateusz.jakub.fila@cern.ch>
Date: Wed, 18 Dec 2024 08:54:51 +0100
Subject: [PATCH] update readme

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.md b/README.md
index 7ff25cf..caee2d6 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,8 @@ First fetch the documentation pages from other key4hep repositories:
 .github/scripts/fetch_external_sources.sh 
 ```
 
+If the sources already exist but you want to update them, use the `--force` option.
+
 Then build the site locally:
 
 ```sh