diff --git a/codes/classical/bits/graph/adjacency/higman-sims_graph.yml b/codes/classical/bits/graph/adjacency/higman-sims_graph.yml
index ab0aee7a4..f65b2aa47 100644
--- a/codes/classical/bits/graph/adjacency/higman-sims_graph.yml
+++ b/codes/classical/bits/graph/adjacency/higman-sims_graph.yml
@@ -23,7 +23,7 @@ relations:
     - code_id: combinatorial_design
       detail: 'Codewords of weight 36 of the Higman-Sims graph-adjacency code form a \(2\)-\((100,36,525)\) design \cite[Remark 1.7]{doi:10.1109/18.568714}'
     - code_id: leech
-      detail: 'The Higman-Sims graph occurs in the Leech lattice \cite{preset:10.1007/978-1-4757-6568-7}.'
+      detail: 'The Higman-Sims graph occurs in the Leech lattice \cite{doi:10.1007/978-1-4757-6568-7}.'
 
 
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