diff --git a/src/app/core/metadata/head-tag.service.ts b/src/app/core/metadata/head-tag.service.ts
index 6c8d9fd432..d52efb8fa1 100644
--- a/src/app/core/metadata/head-tag.service.ts
+++ b/src/app/core/metadata/head-tag.service.ts
@@ -199,7 +199,6 @@ export class HeadTagService {
     // this.setCitationIssueTag();
     // this.setCitationFirstPageTag();
     // this.setCitationLastPageTag();
-    // this.setCitationDOITag();
     // this.setCitationPMIDTag();
 
     // this.setCitationFullTextTag();