diff --git a/samples/quill.html b/samples/quill.html
index d2eb1f9..32ac967 100644
--- a/samples/quill.html
+++ b/samples/quill.html
@@ -42,7 +42,7 @@
     const quill = new Quill('#editor', {
       theme: 'snow',
     });
-    BesService.registerByElement(quill.root, new BesStatusIconEventSink())
+    BesQuillService.register(quill.root, quill, new BesStatusIconEventSink())
   </script>
 </body>
 
diff --git a/service.js b/service.js
index 552e2d9..c9328ac 100644
--- a/service.js
+++ b/service.js
@@ -1136,6 +1136,110 @@ class BesCKService extends BesTreeService {
   }
 }
 
+/**************************************************************************************************
+ *
+ * Quill editor grammar-checking service
+ *
+ *************************************************************************************************/
+class BesQuillService extends BesTreeService {
+  /**
+   * Constructs class.
+   *
+   * @param {Element} hostElement The element in DOM tree we are providing grammar-checking service
+   *                              for
+   * @param {*} quillInstance Quill instance
+   * @param {*} eventSink Event sink for notifications
+   */
+  constructor(hostElement, quillInstance, eventSink) {
+    super(hostElement, hostElement, eventSink)
+    this.quillInstance = quillInstance
+    this.onChangeData = this.onChangeData.bind(this)
+    this.quillInstance.on('text-change', delta => {
+      this.onChangeData(delta)
+    })
+  }
+
+  /**
+   * Registers grammar checking service.
+   *
+   * @param {Element} hostElement DOM element to register grammar checking service for
+   * @param {Quill} quillInstance Enable Quill tweaks
+   * @param {*} eventSink Event sink for notifications
+   * @returns {BesQuillService} Grammar checking service instance
+   */
+  static register(hostElement, quillInstance, eventSink) {
+    let service = BesService.getServiceByElement(hostElement)
+    if (service) return service
+    service = new BesQuillService(hostElement, quillInstance, eventSink)
+    if (service.eventSink && 'register' in service.eventSink)
+      service.eventSink.register(service)
+    // Defer proofing giving user a chance to configure the service.
+    service.scheduleProofing(10)
+    return service
+  }
+
+  /**
+   * Unregisters grammar checking service.
+   */
+  unregister() {
+    this.quillInstance.off('change:data', this.onChangeData)
+    if (this.timer) clearTimeout(this.timer)
+    super.unregister()
+  }
+
+  /**
+   * Called to report the text has changed
+   */
+  onChangeData(delta) {
+    let index = 0
+    let reproofNeeded = false
+
+    delta.ops.forEach(op => {
+      if (op.retain) {
+        index += op.retain
+        if (op.attributes) {
+          reproofNeeded = true
+        }
+      } else if (op.insert) {
+        reproofNeeded = true
+        index += op.insert.length
+      } else if (op.delete) {
+        reproofNeeded = true
+      }
+    })
+
+    if (reproofNeeded) {
+      const [leaf, offset] = this.quillInstance.getLeaf(index)
+      let domElement = leaf.domNode
+      while (domElement && domElement.tagName !== 'P') {
+        domElement = domElement.parentNode
+      }
+      this.clearProofing(domElement)
+
+      setTimeout(() => {
+        this.repositionAllMarkup()
+        this.scheduleProofing(1000)
+      }, 0)
+    }
+  }
+
+  /**
+   * Replaces grammar checking match with a suggestion provided by grammar checking service.
+   *
+   * @param {*} el Block element/paragraph containing grammar checking rule match
+   * @param {*} match Grammar checking rule match
+   * @param {String} replacement Text to replace grammar checking match with
+   */
+  replaceText(el, match, replacement) {
+    if (this.timer) clearTimeout(this.timer)
+    if (this.abortController) this.abortController.abort()
+    this.clearProofing(el)
+    match.range.deleteContents()
+    match.range.insertNode(document.createTextNode(replacement))
+    this.scheduleProofing(20)
+  }
+}
+
 /**************************************************************************************************
  *
  * Plain-text grammar-checking service
@@ -2260,3 +2364,4 @@ window.BesCKService = BesCKService
 window.BesDOMPlainTextService = BesDOMPlainTextService
 window.BesTAService = BesTAService
 window.BesPopup = BesPopup
+window.BesQuillService = BesQuillService