diff --git a/make/defs.mk b/make/defs.mk
index 12adf33d..b286a5de 100644
--- a/make/defs.mk
+++ b/make/defs.mk
@@ -347,7 +347,7 @@ INSTALLED_HDR               += $(addprefix $(INSTALL_HDRDIR)/,$(SRC_H))
 
 # -- DOC
 INSTALLATION_FILE_TYPES     += DOC
-DOCS                        += $(wildcard VERSION README* CHANGES TODO* LICENSE AUTHORS CREDITS RELEASES *.pdf *.txt *.html)
+DOCS                        += $(wildcard $(sort VERSION README* CHANGES TODO* LICENSE AUTHORS CREDITS RELEASES *.pdf *.txt *.html *.md))
 DOCSUBDIRS                  += $(wildcard html tex info examples src)
 
 BUILD_DOCDIR                ?= $(TOPDIR)/doc