diff --git a/front_matter/create_extractor.ts b/front_matter/create_extractor.ts
index 24f116354..d746f0d21 100644
--- a/front_matter/create_extractor.ts
+++ b/front_matter/create_extractor.ts
@@ -7,16 +7,19 @@ import {
 
 type Format = "yaml" | "toml" | "json" | "unknown";
 
+/** Return type for {@linkcode Extractor}. */
 export type Extract<T> = {
   frontMatter: string;
   body: string;
   attrs: T;
 };
 
+/** Function return type for {@linkcode createExtractor}. */
 export type Extractor = <T = Record<string, unknown>>(
   str: string,
 ) => Extract<T>;
 
+/** Parser function type used alongside {@linkcode createExtractor}. */
 export type Parser = <T = Record<string, unknown>>(str: string) => T;
 
 function _extract<T>(