docs: Added note about non-US exchanges

README.md

@@ -94,6 +94,7 @@ With `--show-tags`, `--show-fundamentals`, and `--show-separator` options set, t
 
 * **Real-time quotes** - Quotes are pulled from Yahoo finance which may provide delayed stock quotes depending on the exchange. The major US exchanges (NYSE, NASDAQ) have real-time quotes however other exchanges may not. Consult the [help article](https://help.yahoo.com/kb/SLN2310.html) on exchange delays to determine which exchanges you can expect delays for or use the `--show-tags` flag to include timeliness of data alongside quotes in `ticker`.
 * **Cryptocurrencies**  - `ticker` supports any cryptocurrency Yahoo / CoinMarketCap supports. A full list can be found [here](https://finance.yahoo.com/cryptocurrencies?offset=0&count=100)
+* **Non-US Symbol** - Non-US symbols may differ from what they are natively named in those exchanges. Try searching the native name in [Yahoo finance](https://finance.yahoo.com/) to determine the symbol to use in `ticker`
 
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