diff --git a/lib/ace/document.js b/lib/ace/document.js
index 20250ba7..6a6d2b98 100644
--- a/lib/ace/document.js
+++ b/lib/ace/document.js
@@ -300,7 +300,7 @@ var Document = function(text) {
      * Removes a range of full lines
      * 
      * @param firstRow {Integer} The first row to be removed
-     * @param firstRow {Integer} The first row to be removed
+     * @param lastRow {Integer} The last row to be removed
      * @return {String[]} The removed lines
      */
     this.removeLines = function(firstRow, lastRow) {