diff --git a/lib/models/node.js b/lib/models/node.js
index 5d3046374..6f1e9a670 100644
--- a/lib/models/node.js
+++ b/lib/models/node.js
@@ -621,14 +621,14 @@ const Node = {
   },
 
   /**
-   * Insert `text` at a `range`.
+   * Insert text `string` at a `range`.
    *
    * @param {Selection} range
-   * @param {String} text
+   * @param {String} string
    * @return {Node} node
    */
 
-  insertTextAtRange(range, text) {
+  insertTextAtRange(range, string) {
     let node = this
     range = range.normalize(node)
 
@@ -638,31 +638,13 @@ const Node = {
       range = range.moveToStart()
     }
 
-    let { startKey, startOffset } = range
-    let startNode = node.getDescendant(startKey)
-    let { characters } = startNode
+    // Insert text at the range's offset.
+    const { startKey, startOffset } = range
+    let text = node.getDescendant(startKey)
+    text = text.insertText(string, startOffset)
+    node = node.updateDescendant(text)
 
-    // Create a list of the new characters, with the marks from the previous
-    // character if one exists.
-    const prev = characters.get(startOffset - 1)
-    const marks = prev ? prev.marks : null
-    const newChars = Character.createList(text.split('').map((char) => {
-      const obj = { text: char }
-      if (marks) obj.marks = marks
-      return obj
-    }))
-
-    // Splice in the new characters.
-    characters = characters.slice(0, startOffset)
-      .concat(newChars)
-      .concat(characters.slice(startOffset))
-
-    // Update the existing text node.
-    startNode = startNode.merge({ characters })
-    node = node.updateDescendant(startNode)
-
-    // Normalize the node.
-    return node.normalize()
+    return node
   },
 
   /**
diff --git a/lib/models/text.js b/lib/models/text.js
index 47a7c7b33..fafdc5db8 100644
--- a/lib/models/text.js
+++ b/lib/models/text.js
@@ -1,5 +1,6 @@
 
 import Character from './character'
+import Mark from './mark'
 import uid from 'uid'
 import { List, Record } from 'immutable'
 
@@ -82,6 +83,32 @@ class Text extends Record(DEFAULTS) {
     return this.merge({ characters })
   }
 
+  /**
+   * Insert text `string` at `index`.
+   *
+   * @param {String} string
+   * @param {Numbder} index
+   * @return {Text} text
+   */
+
+  insertText(string, index) {
+    let { characters } = this
+    const prev = index ? characters.get(index - 1) : null
+    const marks = prev ? prev.marks : Mark.createSet()
+    const chars = Character.createList(string.split('').map((char) => {
+      return {
+        text: char,
+        marks
+      }
+    }))
+
+    characters = characters.slice(0, index)
+      .concat(chars)
+      .concat(characters.slice(index))
+
+    return this.merge({ characters })
+  }
+
 }
 
 /**