diff --git a/src/math/categories/categories.pysty3 b/src/math/categories/categories.pysty3
index ccf6f1b..13a205f 100644
--- a/src/math/categories/categories.pysty3
+++ b/src/math/categories/categories.pysty3
@@ -154,9 +154,11 @@ __HEADER__(Definitions of categories with automatic indexing)%% Wrapper commands
     \translate{CGHaus~(Category~description)}
   ]
 \DeclareSimpleCategory
+  [
+    formula = S
+  ]
   { SimplicialSet }
   [
-    formula = S,
     \translate{SimplicialSet~(Category~description)}
   ]
 \DeclareCategory