diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4b1148482221f6167115f514e65acf42eb63728f..ef4c31393d93edb0451aa3fa166173026e36f2f7 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,5 +1,12 @@
 # Objectifs
 
+## Session 1
+- add tuto on how to connect to the Rstudio serveur hosted at the IFB
+
+## Supplementary exercices
 - Write the session_1/bioconductor.Rmd training (and add link in session_1.Rmd)
 - Write the session_1/github.Rmd training (and add link in session_1.Rmd)
-- Write the WDI.Rmd training which will be for a later session
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+- Write the WDI.Rmd training which will be for a later session
+- Write tuto to create IFB accout and launch Rstudio server
+- Write session_2/exel.Rmd to load an exel version of the mpg data
+- Write session_2/ggannimate.Rmd https://exts.ggplot2.tidyverse.org/gallery/ or another example of ggplot2 addons
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