--- old/modules/javafx.base/src/main/java/javafx/beans/InvalidationListener.java	2018-04-07 06:50:10.958880700 +0300
+++ new/modules/javafx.base/src/main/java/javafx/beans/InvalidationListener.java	2018-04-07 06:50:10.546046700 +0300
@@ -53,7 +53,7 @@
      * {@code InvalidationListener}. It is called if an {@link Observable}
      * becomes invalid.
      * <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