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-rw-r--r--Documentation/bpf/prog_flow_dissector.rst3
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diff --git a/Documentation/bpf/prog_flow_dissector.rst b/Documentation/bpf/prog_flow_dissector.rst
index a78bf036cadd..4d86780ab0f1 100644
--- a/Documentation/bpf/prog_flow_dissector.rst
+++ b/Documentation/bpf/prog_flow_dissector.rst
@@ -142,3 +142,6 @@ BPF flow dissector doesn't support exporting all the metadata that in-kernel
C-based implementation can export. Notable example is single VLAN (802.1Q)
and double VLAN (802.1AD) tags. Please refer to the ``struct bpf_flow_keys``
for a set of information that's currently can be exported from the BPF context.
+
+When BPF flow dissector is attached to the root network namespace (machine-wide
+policy), users can't override it in their child network namespaces.