diff --git a/.Rbuildignore b/.Rbuildignore
index 2e64761..9d4e3ad 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -3,3 +3,4 @@
 ^Makefile$
 ^.travis.yml$
 ^appveyor.yml$
+^README.markdown$
diff --git a/Makefile b/Makefile
index dd7836b..d7f9465 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 
-all: README.md
+all: README.markdown
 
-README.md: README.Rmd
+README.markdown: README.Rmd
 	Rscript -e "library(knitr); knit('$<', output = '$@', quiet = TRUE)"
diff --git a/README.md b/README.markdown
similarity index 100%
rename from README.md
rename to README.markdown