Add multi-monitor question to FAQ.

Author: octalmage

README.md

@@ -149,6 +149,10 @@ Soon! This is a bit more complicated than the rest of the features, so I saved i
 
 We've been implementing keys as we need them. Feel free to create an issue or submit a pull request!
 
+#### How about multi-monitor support?
+
+The library doesn't have explicit multi-monitor support, so anything that works is kind of on accident. Subscribe to [#88](https://github.com/octalmage/robotjs/issues/88) for updates.
+
 For any other questions please [submit an issue](https://github.com/octalmage/robotjs/issues/new).
 
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