update readme

key4hep · Dec 18, 2024 · 44baa3b · 44baa3b
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commit 44baa3b
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diff --git 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