diff --git a/docs/strategy-customization.md b/docs/strategy-customization.md
index 9e32ded18..5cf3784ef 100644
--- a/docs/strategy-customization.md
+++ b/docs/strategy-customization.md
@@ -36,9 +36,14 @@ A strategy file contains all the information needed to build a good strategy:
 - Minimal ROI recommended
 - Stoploss strongly recommended
 
-The bot also include a sample strategy called `TestStrategy` you can update: `user_data/strategies/test_strategy.py`.
+The bot includes a sample strategy called `TestStrategy` you can update: `user_data/strategies/test_strategy.py`.
 You can test it with the parameter: `--strategy TestStrategy`
 
+Additionally, there is an attribute called `INTERFACE_VERSION`, which defines the version of the strategy interface the bot should use.
+The current version is 2 - which is also the default when it's not set explicitly in the strategy.
+
+Future versions will require this to be set.
+
 ```bash
 freqtrade --strategy AwesomeStrategy
 ```