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-This wiki page is meant to be a place where everyone can find and contribute examples on how to use Telethon. All examples shown here assume that you've successfully created a client as follows:
+This wiki page is meant to be a place where everyone can find and contribute examples on how to use Telethon.
+
+**It is very important** that your system time is on sync! Telegram won't send a reply back *at all* if your system time is too ahead of the current time, or too behind. This will most likely be the cause for the following errors:
+```
+BlockingIOError: [Errno 11] Resource temporarily unavailable
+BlockingIOError: [Errno 35] Resource temporarily unavailable
+TimeoutError: The read operation exceeded the timeout.
+```
+
+Please check this out before opening an issue.
+
+All examples shown here assume that you've successfully created a client as follows:
 ```python
 from telethon import TelegramClient