diff --git a/Home.md b/Home.md
index 82a9871..38470cd 100644
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+++ b/Home.md
@@ -13,4 +13,11 @@ The online documentation for all available requests, types and constructors is a
 
 ## Possible problems
 
-If you ever receive a `PEER_FLOOD` error or aren't able to perform certain requests, it might mean that your account is limited, and there's not much Telethon can do about this. Talk to [@SpamBot](https://t.me/SpamBot) for more information, or refer to the [spam FAQ](https://www.telegram.org/faq_spam).
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+If you ever receive a `PEER_FLOOD` error or aren't able to perform certain requests, it might mean that your account is limited, and there's not much Telethon can do about this. Talk to [@SpamBot](https://t.me/SpamBot) for more information, or refer to the [spam FAQ](https://www.telegram.org/faq_spam).
+
+## Optional dependencies
+If you're using the library under ARM (or even if you aren't), you may want to install `sympy` through `pip` for a substantial speed-up when generating the keys required to connect to Telegram (you can of course do this on desktop too). See [issue #199](https://github.com/LonamiWebs/Telethon/issues/199>] for more.
+
+If `libssl` is available on your system, it will also be used wherever encryption is needed.
+
+If neither of these are available, a pure Python callback will be used instead, so you can still run the library wherever Python is available!
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