diff --git a/packages/popper/index.d.ts b/packages/popper/index.d.ts
index a180fa1681..0d419b93f4 100644
--- a/packages/popper/index.d.ts
+++ b/packages/popper/index.d.ts
@@ -35,6 +35,11 @@ declare namespace Popper {
 
   export type ModifierFn = (data: Data, options: Object) => Data;
 
+  export interface Attributes {
+    'x-out-of-boundaries': '' | false;
+    'x-placement': Placement;
+  }
+
   export interface BaseModifier {
     order?: number;
     enabled?: boolean;
@@ -92,6 +97,7 @@ declare namespace Popper {
     arrowElement: Element;
     styles: CSSStyleDeclaration;
     arrowStyles: CSSStyleDeclaration;
+    attributes: Attributes;
     boundaries: Object;
     offsets: {
       popper: Offset,
diff --git a/packages/popper/tests/types/type-tests.ts b/packages/popper/tests/types/type-tests.ts
index e32fca6b50..bf9feb540e 100644
--- a/packages/popper/tests/types/type-tests.ts
+++ b/packages/popper/tests/types/type-tests.ts
@@ -50,6 +50,8 @@ const options: Popper.PopperOptions = {
     console.log(data);
   },
   onUpdate(data) {
+    console.log('x-out-of-boundaries', data.attributes);
+    console.log('x-placement', data.attributes['x-placement']);
     data.styles.alignContent = 'flex-start';
   }
 };