diff --git a/assignment-1b/Makefile b/assignment-1b/Makefile
index 41f0b60..6355786 100644
--- a/assignment-1b/Makefile
+++ b/assignment-1b/Makefile
@@ -2,6 +2,7 @@
 
 .PRECIOUS: $(EXAMPLES_PPM)
 
+RAYTRACER_FLAGS :=
 DOCKER := docker
 ZIP := zip
 PANDOC := pandoc
@@ -39,7 +40,7 @@ $(SHOWCASE): examples/soft-shadow-demo.png
 	cp $< $@
 
 examples/%.ppm: examples/%.txt $(SOURCES)
-	cargo run --release -- -o $@ $<
+	cargo run --release -- -o $@ $(RAYTRACER_FLAGS) $<
 
 examples/%.png: examples/%.ppm
 	convert $< $@