src/java.base/share/classes/java/lang/reflect/AccessibleObject.java

*** 174,183 ****
--- 174,190 ----
       * members with default (package) access, protected instance members, or
       * protected constructors when the declaring class is in a different module
       * to the caller and the package containing the declaring class is not open
       * to the caller's module. </p>
       *
+      * <p> If this reflected object is a final field declared in a
+      * {@linkplain Class#isHiddenClass() hidden class}, this method can
+      * only be used to suppress checks for Java language access control
+      * to gain read access but not write access even if the {@code accessible}
+      * flag is {@code true}.  That is, final fields in a hidden class are
+      * not modifiable.
+      *
       * <p> If there is a security manager, its
       * {@code checkPermission} method is first called with a
       * {@code ReflectPermission("suppressAccessChecks")} permission.
       *
       * @param flag the new value for the {@code accessible} flag