diff --git a/TemplateDataBlob.php b/TemplateDataBlob.php
index 58c4f41c..4a4a53ed 100644
--- a/TemplateDataBlob.php
+++ b/TemplateDataBlob.php
@@ -69,6 +69,7 @@ class TemplateDataBlob {
 			'number',
 			'string/wiki-page-name',
 			'string/wiki-user-name',
+			'string/line',
 		);
 
 		if ( $data === null ) {
diff --git a/spec.templatedata.json b/spec.templatedata.json
index ccec8a39..26e8cf32 100644
--- a/spec.templatedata.json
+++ b/spec.templatedata.json
@@ -48,6 +48,8 @@
 	- string/wiki-user-name
 	  A valid MediaWiki user name for the current wiki. Doesn't have to exist,
 	  but if not should be a valid user name to create.
+	- string/line
+	  Short text field - use for names, labels, and other short-form fields.
 
 @structure {string|Object} InterfaceText
 	A free-form string (no wikitext) in the content-language of the wiki, or,