add todo about md grammar in vscode

diff --git a/todo.md b/todo.md
index 6e2200bd6d8453cb6170e982813f29062a7a93ef..219bbc381dd41c11ad476e7f9c055c2dfe077cbf 100644 (file)
--- a/todo.md
+++ b/todo.md
@@ -108,6 +108,13 @@ Code blocks should support filenames. Bash should support setting PWD before run
 
 ### Commands to edit markdown like Emacs edits org mode
 
+### Add extended markdown grammar to VS Code
+
+VS Code doesn't recognize footnotes or checklists. This guide helps you add it 
+to the grammar so that it does.
+
+https://code.visualstudio.com/api/language-extensions/syntax-highlight-guide#tokenization
+
 ### Hover-over summary
 
 Like what Wikipedia does.
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