diff --git a/content/knowledge-base/guides/write-a-composition-function-in-python.md b/content/knowledge-base/guides/write-a-composition-function-in-python.md
index b5f074ab..ce09a010 100644
--- a/content/knowledge-base/guides/write-a-composition-function-in-python.md
+++ b/content/knowledge-base/guides/write-a-composition-function-in-python.md
@@ -479,7 +479,7 @@ if __name__ == "__main__":
 
 Run the unit tests using `hatch run`:
 
-```shell
+```shell {copy-lines="1"}
 hatch run test:unit
 .
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