diff --git a/code/.R/session_03_hello_git.R b/code/.R/session_03_hello_git.R
index 4eab819..aab7420 100644
--- a/code/.R/session_03_hello_git.R
+++ b/code/.R/session_03_hello_git.R
@@ -4,7 +4,7 @@ library(tidyverse)
 
 #read data
 
-dat <- read_csv('data/stocks.xlsx')
+dat <- read_csv('data/stocks.csv') 
 
 # compute returns