diff --git a/module3/exo3/exercice_en.Rmd b/module3/exo3/exercice_en.Rmd
index cfcb70ac94f01d626f77c187169bfcdc3291e325..ceb4d7fa423720db65519f69cfda094e3932ab2a 100644
--- a/module3/exo3/exercice_en.Rmd
+++ b/module3/exo3/exercice_en.Rmd
@@ -1,5 +1,5 @@
 ---
-title: "CO2 Keeling Curve and Hisitorical Ice Core Data"
+title: "CO2 Keeling Curve and Historical Ice Core Data"
 author: "David Elser"
 date: "05-03-2021"
 output: pdf_document
@@ -11,10 +11,10 @@ output: pdf_document
 
 The data is available from the  Web site of the Scripps Institute
 
-"https://scrippsco2.ucsd.edu/data/atmospheric_co2/primary_mlo_co2_record.html"
-"https://scrippsco2.ucsd.edu/assets/data/atmospheric/merged_ice_core_mlo_spo/merged_ice_core_yearly.csv"
+<https://scrippsco2.ucsd.edu/data/atmospheric_co2/primary_mlo_co2_record.html>
+<https://scrippsco2.ucsd.edu/data/atmospheric_co2/icecore_merged_products.html>
 
-Soure script available at : https://github.com/DemirhanOzelTrojan/Keeling_Predict/blob/master/main.R
+Soure script for the Keeling Curve available at : https://github.com/DemirhanOzelTrojan/Keeling_Predict/blob/master/main.R
 
 `
 install.packages('forecast', dependencies = TRUE)
diff --git a/module3/exo3/exercice_en.pdf b/module3/exo3/exercice_en.pdf
index 472440135a5b5acf04d41e8bc430d6478cb3ac1e..3349706bf9dffb07619f60a16fbb9686704c1930 100644
Binary files a/module3/exo3/exercice_en.pdf and b/module3/exo3/exercice_en.pdf differ