diff --git a/include/boost/preprocessor/arithmetic/add.hpp b/include/boost/preprocessor/arithmetic/add.hpp
index 706f464..ee6c662 100644
--- a/include/boost/preprocessor/arithmetic/add.hpp
+++ b/include/boost/preprocessor/arithmetic/add.hpp
@@ -8,6 +8,7 @@
 #  */
 #
 # /* Revised by Paul Mensonides (2002) */
+# /* Revised by Edward Diener (2020) */
 #
 # /* See http://www.boost.org for most recent version. */
 #