diff --git a/kernel/configs/README.md b/kernel/configs/README.md
index 7e9a5e668c..e664095b44 100644
--- a/kernel/configs/README.md
+++ b/kernel/configs/README.md
@@ -55,6 +55,12 @@ into a fragment.
 If adding config entries for a new subsystem or feature, consider making a new
 fragment with an appropriately descriptive name.
 
+If you want to disable an entire fragment for a specific architecture, you can add the tag `# !${arch}` in the first line of the fragment. You can also exclude multiple architectures on the same line. Note the `#` at the beginning of the line, this is required to avoid that the tag is interpreted as a configuration.
+Example of valid exclusion:
+```
+# !s390x !ppc64le
+```
+
 The fragment gathering tool perfoms some basic sanity checks, and the `build-kernel.sh` will
 fail and report the error in the cases of: