Update report.rst (microsoft#980)

qianyun210603 · Mar 15, 2022 · 01508a0 · 01508a0
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diff --git a/docs/component/report.rst b/docs/component/report.rst
@@ -20,6 +20,9 @@ Introduction
     - model_performance_graph
 
 
+All of the accumulated profit metrics(e.g. return, max drawdown) in Qlib are calculated by summation.
+This avoids the metrics or the plots being skewed exponentially over time.
+
 Graphical Reports
 ===================