diff --git a/src/wasm/horizontal_rule.rs b/src/wasm/horizontal_rule.rs
index 0103cf63..ecb62e0d 100644
--- a/src/wasm/horizontal_rule.rs
+++ b/src/wasm/horizontal_rule.rs
@@ -6,6 +6,7 @@ use super::macros::to_wasm;
 use super::to_wasm::ToWasm;
 use super::AdditionalProperties;
 use crate::compare::ElispFact;
+use crate::types::GetAffiliatedKeywords;
 use crate::types::HorizontalRule;
 use crate::wasm::to_wasm::ToWasmStandardProperties;
 
@@ -21,12 +22,16 @@ to_wasm!(
     original,
     wasm_context,
     { WasmAstNode::HorizontalRule(original) },
-    { "TODO".into() },
+    { "horizontal-rule".into() },
     {
+        let additional_properties = original
+            .get_affiliated_keywords()
+            .to_wasm(wasm_context.clone())?;
+
         Ok((
             Vec::new(),
             WasmHorizontalRule {
-                additional_properties: AdditionalProperties::default(),
+                additional_properties,
             },
         ))
     }