diff --git a/packages/popper/index.d.ts b/packages/popper/index.d.ts
index 07147c51d0..2b23a99dda 100644
--- a/packages/popper/index.d.ts
+++ b/packages/popper/index.d.ts
@@ -158,6 +158,8 @@ declare class Popper {
   static Defaults: PopperOptions;
 
   options: PopperOptions;
+  popper: Element;
+  reference: Element | ReferenceObject;
 
   constructor(reference: Element | ReferenceObject, popper: Element, options?: PopperOptions);
 
diff --git a/packages/popper/index.js.flow b/packages/popper/index.js.flow
index b950d3867b..aa111454d6 100644
--- a/packages/popper/index.js.flow
+++ b/packages/popper/index.js.flow
@@ -142,6 +142,9 @@ declare module 'popper.js' {
   declare class Popper {
     static placements: Placement;
 
+    popper: Element;
+    reference: Element | ReferenceObject;
+
     constructor(
       reference: Element | ReferenceObject,
       popper: Element,
diff --git a/packages/popper/src/index.js b/packages/popper/src/index.js
index 8f054e28de..3f37a06699 100644
--- a/packages/popper/src/index.js
+++ b/packages/popper/src/index.js
@@ -14,8 +14,8 @@ export default class Popper {
   /**
    * Creates a new Popper.js instance.
    * @class Popper
-   * @param {HTMLElement|referenceObject} reference - The reference element used to position the popper
-   * @param {HTMLElement} popper - The HTML element used as the popper
+   * @param {Element|referenceObject} reference - The reference element used to position the popper
+   * @param {Element} popper - The HTML / XML element used as the popper
    * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)
    * @return {Object} instance - The generated Popper.js instance
    */