diff --git a/src/core/service/api/create-intersection-observer.js b/src/core/service/api/create-intersection-observer.js
index 9d20cd0c3f66a6b88baa690285ff8dc58988e4e8..c184e113b25dae856b681c55f232bf9caa4db5e8 100644
--- a/src/core/service/api/create-intersection-observer.js
+++ b/src/core/service/api/create-intersection-observer.js
@@ -20,10 +20,12 @@ class MPIntersectionObserver {
   relativeTo (selector, margins) {
     this.options.relativeToSelector = selector
     this._makeRootMargin(margins)
+    return this
   }
   relativeToViewport (margins) {
     this.options.relativeToSelector = null
     this._makeRootMargin(margins)
+    return this
   }
   observe (selector, callback) {
     if (typeof callback !== 'function') {