--- old/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/javac.properties	2020-07-29 11:38:40.650000000 -0700
+++ new/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/javac.properties	2020-07-29 11:38:39.930000000 -0700
@@ -182,6 +182,9 @@
 javac.opt.Xlint.desc.classfile=\
     Warn about issues related to classfile contents.
 
+javac.opt.Xlint.desc.default-ctor=\
+    Warn about use of default (implicit) constructors in public classes in exported packages.
+
 javac.opt.Xlint.desc.deprecation=\
     Warn about use of deprecated items.