--- old/modules/javafx.base/src/main/java/javafx/beans/value/ChangeListener.java	2018-04-07 06:50:13.625306700 +0300
+++ new/modules/javafx.base/src/main/java/javafx/beans/value/ChangeListener.java	2018-04-07 06:50:13.240374100 +0300
@@ -50,7 +50,7 @@
      * {@code ChangeListener}. It is called if the value of an
      * {@link ObservableValue} changes.
      * <p>
-     * In general is is considered bad practice to modify the observed value in
+     * In general, it is considered bad practice to modify the observed value in
      * this method.
      *
      * @param observable