diff --git a/strategies/advances-and-declines/README.md b/strategies/advances-and-declines/README.md
index cee4461..58a2781 100644
--- a/strategies/advances-and-declines/README.md
+++ b/strategies/advances-and-declines/README.md
@@ -4,6 +4,8 @@ The idea for these strategies comes from chapter 5 (Market Breadth) of [*How Mar
 
 As with most of the strategies from this book, they are meant to illustrate certain characteristics of the market rather than be traded directly.
 
+Advances refers to the number of stocks going up in the index (e.g., S&P 500) whereas Declines are the stocks going down.
+
 ## Rules
 
 ### Advances