diff --git a/examples/stocks/yfinance/lstm.kg b/examples/stocks/yfinance/lstm.kg
index 8e59361..81307b5 100644
--- a/examples/stocks/yfinance/lstm.kg
+++ b/examples/stocks/yfinance/lstm.kg
@@ -33,6 +33,7 @@ wmax::{(x@>x)@0}'windows
 windows::wmax{y%x}'windows
 labels::wmax{y%x}'labels
 
+:" split data into training and test sets "
 trainx::(-1)_windows;trainy::(-1)_labels
 testx::windows@-1;testy::labels@-1