diff --git a/lib/d/Makefile.am b/lib/d/Makefile.am
index a4e3188..04c0639 100644
--- a/lib/d/Makefile.am
+++ b/lib/d/Makefile.am
@@ -180,4 +180,4 @@
 EXTRA_DIST = \
 	src \
 	test \
-	README
+	README.md
diff --git a/lib/d/README b/lib/d/README.md
similarity index 100%
rename from lib/d/README
rename to lib/d/README.md