diff --git a/ra/1.1/Makefile b/ra/1.1/Makefile
index 2cebe61..4b112c8 100644
--- a/ra/1.1/Makefile
+++ b/ra/1.1/Makefile
@@ -1,19 +1,23 @@
 # Basic DocBook mangling makefile. 
 #
 # 
 
 BASENAME=resource-agent-api
+GRAMMAR=ra-api.rng
+TEST_FILES=ra-metadata-example.xml
 
 .PHONY: all clean
 
 %.html: %.md
 	pandoc -f markdown -o $@ $^
 
 %.pdf: %.md
 	pandoc -f markdown -o $@ $^
 
 all: $(BASENAME).pdf $(BASENAME).html
 
 clean:
 	rm -f $(BASENAME).pdf $(BASENAME).html
 
+check: $(GRAMMAR) $(TEST_FILES)
+	xmllint --relaxng $(GRAMMAR) --noout $(TEST_FILES)