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-rw-r--r--synapse/rest/media/v1/preview_url_resource.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index e1212313e1..64ad218f70 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -334,6 +334,7 @@ class PreviewUrlResource(Resource):
 
                 # We don't just use XPATH here as that is slow on some machines.
 
+                # We clone `tree` as we modify it.
                 cloned_tree = deepcopy(tree.find("body"))
 
                 TAGS_TO_REMOVE = ("header", "nav", "aside", "footer", "script", "style",)