The examine tab now lists the available pen commands.

code/modules/examine/descriptions/paperwork.dm

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+/obj/item/weapon/pen
+	description_info = {"This is an item for writing down your thoughts, on paper or elsewhere. The following special commands are available:
+Pen and crayon commands
+\[br\] : Creates a linebreak.
+\[center\] - \[/center\] : Centers the text.
+\[h1\] - \[/h1\] : Makes the text a first level heading.
+\[h2\] - \[/h2\] : Makes the text a second level headin.
+\[h3\] - \[/h3\] : Makes the text a third level heading.
+\[b\] - \[/b\] : Makes the text bold.
+\[i\] - \[/i\] : Makes the text italic.
+\[u\] - \[/u\] : Makes the text underlined.
+\[large\] - \[/large\] : Increases the size of the text.
+\[sign\] : Inserts a signature of your name in a foolproof way.
+\[field\] : Inserts an invisible field which lets you start type from there. Useful for forms.
+\[date\] : Inserts today's station date.
+\[time\] : Inserts the current station time.
+Pen exclusive commands
+\[small\] - \[/small\] : Decreases the size of the text.
+\[list\] - \[/list\] : A list.
+\[*\] : A dot used for lists.
+\[hr\] : Adds a horizontal rule."}