diff --git a/Makefile b/Makefile
index a1b5f2e..7604974 100644
--- a/Makefile
+++ b/Makefile
@@ -1,2 +1,2 @@
-rt:
-	go build -o rt . 
\ No newline at end of file
+rt: *.go
+	go build -o rt .
\ No newline at end of file
diff --git a/readme.md b/readme.md
index 7fd86dd..5af7ae3 100644
--- a/readme.md
+++ b/readme.md
@@ -1 +1,3 @@
-implementing https://raytracing.github.io/books/RayTracingInOneWeekend.html in go
\ No newline at end of file
+# rt
+
+Implementing <https://raytracing.github.io/books/RayTracingInOneWeekend.html> in go.