diff --git a/js/constants/constants.js b/js/constants/constants.js
index 4fe503d97..e05038a88 100644
--- a/js/constants/constants.js
+++ b/js/constants/constants.js
@@ -52,7 +52,7 @@ export const CATEGORY_TYPE_BY_ID = {
   4: CATEGORY_TYPE.OTHER
 };
 
-export const OBSERVATION_TAG_CATEGORIES = ['ConformerSites', 'XtalformSites', 'Quatassemblies'];
+export const OBSERVATION_TAG_CATEGORIES = ['ConformerSites', 'XtalformSites', 'Quatassemblies', 'Xtalforms'];
 export const COMPOUND_PRIO_TAG_CATEGORIES = ['CanonSites'];
 
 export const TAG_TYPE = {