diff --git a/todo4.txt b/todo4.txt
new file mode 100644
index 0000000..6044507
--- /dev/null
+++ b/todo4.txt
@@ -0,0 +1,4 @@
+http://channel9.msdn.com/Series/C9-Lectures-Stephan-T-Lavavej-Core-C-
+http://channel9.msdn.com/Series/C9-Lectures-Stephan-T-Lavavej-Standard-Template-Library-STL-
+https://www.youtube.com/user/handmadeheroarchive/videos
+https://www.youtube.com/playlist?list=PL3R9mYgM4NVw4m0PTXBzQZBV2DzCt92Sp