diff --git a/angular-formly/angular-formly.d.ts b/angular-formly/angular-formly.d.ts
index d0b336bfd..0e2c7d920 100644
--- a/angular-formly/angular-formly.d.ts
+++ b/angular-formly/angular-formly.d.ts
@@ -440,6 +440,13 @@ declare module AngularFormly {
 		 */
 		runExpressions?: () => void;
 
+
+
+		////////////////// BOOTSTRAP SPECIFIC ///////////////////////
+		fieldGroup?: IFieldConfigurationObject[];
+
 	}
 
+
+
 }
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