diff --git a/todo5.txt b/todo5.txt
new file mode 100644
index 0000000..2e43727
--- /dev/null
+++ b/todo5.txt
@@ -0,0 +1,5 @@
+https://github.com/isocpp/CppCoreGuidelines
+https://github.com/Microsoft/GSL
+https://github.com/scylladb/seastar
+https://github.com/google/brotli
+https://github.com/google/styleguide