diff --git a/src/components/dropdown/dropdown.js b/src/components/dropdown/dropdown.js
index 1c119d5c1dc..35046a2039b 100644
--- a/src/components/dropdown/dropdown.js
+++ b/src/components/dropdown/dropdown.js
@@ -2,7 +2,6 @@ import Vue from '../../utils/vue'
 import { arrayIncludes } from '../../utils/array'
 import { stripTags } from '../../utils/html'
 import { getComponentConfig } from '../../utils/config'
-import { HTMLElement } from '../../utils/safe-types'
 import idMixin from '../../mixins/id'
 import dropdownMixin from '../../mixins/dropdown'
 import normalizeSlotMixin from '../../mixins/normalize-slot'
@@ -72,12 +71,6 @@ export const props = {
   role: {
     type: String,
     default: 'menu'
-  },
-  boundary: {
-    // String: `scrollParent`, `window` or `viewport`
-    // HTMLElement: HTML Element reference
-    type: [String, HTMLElement],
-    default: 'scrollParent'
   }
 }
 
diff --git a/src/components/nav/package.json b/src/components/nav/package.json
index 23b5c2a39c8..192dcfbed5c 100644
--- a/src/components/nav/package.json
+++ b/src/components/nav/package.json
@@ -143,6 +143,11 @@
           {
             "prop": "noCaret",
             "description": "Hide the caret indicator on the toggle button"
+          },
+          {
+            "prop": "boundary",
+            "version": "2.4.0",
+            "description": "The boundary constraint of the menu: 'scrollParent', 'window', 'viewport', or a reference to an HTMLElement. Has no effect when dropdown is inside a b-navbar"
           }
         ],
         "slots": [
diff --git a/src/mixins/dropdown.js b/src/mixins/dropdown.js
index 54bc83fe774..77ef05f2bf4 100644
--- a/src/mixins/dropdown.js
+++ b/src/mixins/dropdown.js
@@ -4,6 +4,7 @@ import { BvEvent } from '../utils/bv-event.class'
 import { closest, contains, isVisible, requestAF, selectAll } from '../utils/dom'
 import { hasTouchSupport } from '../utils/env'
 import { isNull } from '../utils/inspect'
+import { HTMLElement } from '../utils/safe-types'
 import { warn } from '../utils/warn'
 import clickOutMixin from './click-out'
 import focusInMixin from './focus-in'
@@ -108,6 +109,12 @@ export default {
     popperOpts: {
       // type: Object,
       default: () => {}
+    },
+    boundary: {
+      // String: `scrollParent`, `window` or `viewport`
+      // HTMLElement: HTML Element reference
+      type: [String, HTMLElement],
+      default: 'scrollParent'
     }
   },
   data() {