diff --git a/.gitignore b/.gitignore
index 366ca6453..d10c65112 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,4 +13,3 @@ test/tmp_*
 test/fixtures/samples/*.actual*
 
 dist/*.js
-todo.md
diff --git a/todo.md b/todo.md
new file mode 100644
index 000000000..d85ab5d61
--- /dev/null
+++ b/todo.md
@@ -0,0 +1,3 @@
+- Upgrade d3 to version 4
+- use external d3-textwrap library
+    - Problem is it's for d3 v4 only