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diff --git a/HACKING.md b/HACKING.md
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@@ -1,3 +1,12 @@
 helpful to remember: `infocmp` prints terminfo in a readable way. `infocmp dumb` zB prints dumb terminal info
 
+[control sequence docs, xterm](https://invisible-island.net/xterm/ctlseqs/ctlseqs.html)
+
+contributions should not do any of the following things:
+
+- add needless dependencies or features
+- add support for a proprietary platform
+
+if a depedency is a 'convenience' but not a necesity, look at how they implement the functionality and write it yourself.
+
 Miracode is from [here](https://github.com/IdreesInc/Miracode) and is [freely licensed](https://github.com/IdreesInc/Miracode/blob/main/LICENSE)