DEVELOPING.md: add list of files with always updated copyright

diff --git a/DEVELOPING.md b/DEVELOPING.md
index b4b5944c7c7efd2c61938a1d52db1cf6b67b5776..174ff8a17c6662ca3187f66c4c0ad5a773bfde3e 100644 (file)
--- a/DEVELOPING.md
+++ b/DEVELOPING.md
@@ -126,6 +126,9 @@ If there are changes for a file, which contains copyright notice already
 and the notice is not updated for the current year, update the year of copyright
 notice to include the current year.
 
+Only the following files must have copyright notice updated every year: README.md,
+NOTICE, index.html.in, and header.html.in.
+
 
 ### Source Files