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diff --git a/todo.org b/todo.org
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@@ -25,6 +25,7 @@
 ** TODO figure
 ** TODO arguments
 * TODO insert content                                                  :PbSe:
+* TODO headers                                                 :introduction:
 * TODO cite important CMDS discoveries, reviews                :introduction:
 * TODO summarize PbSe chapter                                  :introduction:
 * TODO summarize MX2 chapter                                   :introduction: