diff --git a/Makefile b/Makefile
index 310949b..04aebd8 100644
--- a/Makefile
+++ b/Makefile
@@ -1,16 +1,20 @@
-PNGS = use_cases_diagram.png schema_diagram.png schema_graph.png
+PNGS = built/use_cases_diagram.png built/schema_diagram.png built/schema_graph.png
 
-all: $(PNGS)
+all: built/ $(PNGS)
 
-schema_diagram.png:
-	sqlt-diagram --color -c 3 -t png -o schema_diagram.png --gutter 60 --from PostgreSQL db_schema.sql --title "Flashy"
-schema_graph.png:
-	sqlt-graph -o schema_graph.png --from PostgreSQL db_schema.sql 
+built/:
+	mkdir -p built
 
-%.png: %.dot
+built/schema_diagram.png:
+	sqlt-diagram --color -c 3 -t png -o built/schema_diagram.png --gutter 60 --from PostgreSQL db_schema.sql --title "Flashy"
+
+built/schema_graph.png:
+	sqlt-graph -o built/schema_graph.png --from PostgreSQL db_schema.sql 
+
+built/%.png: %.dot
 	dot -Tpng -o $@ $< 
 
 clean:
-	rm -f $(PNGS)
+	rm -rf built/
 
 again: clean all