modules/javafx.base/src/main/java/javafx/beans/InvalidationListener.java

@@ -51,11 +51,11 @@
     /**
      * This method needs to be provided by an implementation of
      * {@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
      *            The {@code Observable} that became invalid
      */