diff --git a/codes/quantum/oscillators/stabilizer/lattice/multimodegkp.yml b/codes/quantum/oscillators/stabilizer/lattice/multimodegkp.yml
index 19a4ccee2..b74c6a50a 100644
--- a/codes/quantum/oscillators/stabilizer/lattice/multimodegkp.yml
+++ b/codes/quantum/oscillators/stabilizer/lattice/multimodegkp.yml
@@ -58,6 +58,8 @@ relations:
     - code_id: ampdamp
       detail: 'Transmission schemes with multimode GKP codes achieve, up to a constant-factor offset, the capacity of \hyperref[topic:ad]{AD}, displacement-noise, and thermal-noise Gaussian loss channels \cite{arxiv:quant-ph/0105058,arxiv:1708.07257,arxiv:1801.04731,arxiv:1801.07271}.
       Combining \hyperref[topic:ad]{AD} noise with amplification yields displacement noise, the noise that GKP codes are designed to correct \cite{arxiv:1801.07271}.'
+# - code_id: topological
+#   detail: 'GKP codes form the ground-state subspace of a quantum Hall system, i.e., a system with an infinitely deep cosine potential \cite{arxiv:1507.08966,arxiv:2002.07718,}.'
 
 
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