diff --git a/strategies/overnight/README.md b/strategies/overnight/README.md
index 82d0dc0..ace0f4c 100644
--- a/strategies/overnight/README.md
+++ b/strategies/overnight/README.md
@@ -7,6 +7,10 @@ This strategy was taken from chapter 7 of [Short Term Trading Strategies That Wo
 1. Go long SPY on the close.
 2. Sell on the following open.
 
+It is not possible to enter positions on the close of a bar in NinjaScript, so I have worked around this by incorporating a 1-minute data series into the strategy and entering on the open of the last bar of the day.
+
+The position is exited on the open of the following day as expected.
+
 ## Parameters
 
 **Use Trend Filter**: Whether to use a trend filter to decide when to enter long positions. (Default: false)