diff --git a/cs621/proj4/Makefile b/cs621/proj4/Makefile
new file mode 100644
index 0000000..a9153ee
--- /dev/null
+++ b/cs621/proj4/Makefile
@@ -0,0 +1,14 @@
+
+all: $(patsubst %.java,%.class,$(wildcard *.java))
+
+%.class: %.java
+	javac $^
+
+.PHONY: javadoc
+javadoc:
+	-mkdir doc
+	javadoc -d doc *.java
+
+clean:
+	-rm -f *.class
+	-rm -rf doc