diff --git a/tag_database b/tag_database
index 3a9b2cb60..68504d62a 100644
--- a/tag_database
+++ b/tag_database
@@ -291,6 +291,7 @@ URLJoin:string,utility,regexp
 UUIDGeneratorBrowser:browser,utility,random
 UUIDGeneratorNode:node,utility,random
 validateNumber:utility,math
+when:function
 without:array
 words:string,regexp
 xProd:array,math