diff --git a/Makefile.am b/Makefile.am
index 10735f345..c14c81f67 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -18,7 +18,12 @@ EXTRA_DIST = \
 docs: pdf html doxygen
 
 Doxyfile: $(srcdir)/Doxyfile.in
-	sed -e 's,@srcdir\@,$(srcdir),' $< > $@
+	@echo "Creating $@ from $<..."
+	@( \
+	  echo "### @@@ -= DO NOT EDIT THIS FILE =- @@@ ###" && \
+	  echo "### @@@ Make changes to Doxyfile.in @@@ ###" && \
+	  sed -e 's,@srcdir\@,$(srcdir),' $< \
+	) > $@
 
 doxygen::
 	$(MAKE) Doxyfile