diff --git a/readme.md b/readme.md
index f333822..6a846c2 100644
--- a/readme.md
+++ b/readme.md
@@ -109,7 +109,7 @@ console.log(output)
 /**
  * @this {CompileContext}
  * @type {Handle}
- * @returns {undefined}
+ * @returns {false | undefined}
  */
 function abbr(d) {
   if (d.type !== 'textDirective') return false