diff --git a/docs/Makefile b/docs/Makefile
index aaaeea1..9b89472 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -1,9 +1,15 @@
-MARKDOWN := $(firstword $(shell command -v markdown markdown2 markdown_py 2>/dev/null || echo markdown))
+MARKDOWN := $(firstword $(shell command -v cmark-gfm redcarpet markdown2 markdown markdown_py 2>/dev/null || echo markdown))
+
+# If you have cmark-gfm, you get Github-style tables; otherwise, you don't.
+ifeq ($(notdir $(MARKDOWN)),cmark-gfm)
+MARKDOWN += -e table
+endif
+
 .PHONY: docs
 
 docs: $(subst .md,.html,$(wildcard *.md)) index.html ../README.html
 
-%.html: %.md
+%.html: %.md Makefile
 	$(MARKDOWN) $< | sed -e 's/\.md/\.html/g' > $@.new
 	mv -f $@.new $@