diff --git a/src/index.ts b/src/index.ts
index 5c8e72d..f5c3d5c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -179,6 +179,9 @@ export default function ofm() {
                 }
 
                 tag = slugTag(tag)
+                if (file.data.frontmatter && !file.data.frontmatter.tags.includes(tag)) {
+                    file.data.frontmatter.tags.push(tag)
+                }
 
                 return {
                     type: "link",