diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 8b27a3d3a85d5cdb59636b5afddae6e16ac9a368..adcfaaed014056e878674a1fa2b3aefad4b9457c 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -8,9 +8,7 @@
 
 ## Supplementary exercices
 - Add summary of all code used in the session at the end of the sesssion
-- 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
 - 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
\ No newline at end of file
+- Write session_2/ggannimate.Rmd https://exts.ggplot2.tidyverse.org/gallery/ or another example of ggplot2 addons and cowplot (https://wilkelab.org/cowplot/articles/introduction.html)
\ No newline at end of file
diff --git a/session_1/session_1.Rmd b/session_1/session_1.Rmd
index b4f54e53d7bc93175bd2a154b152ccc9ade19dbb..80784574dfb357e083ce378d16a3f14405427f44 100644
--- a/session_1/session_1.Rmd
+++ b/session_1/session_1.Rmd
@@ -695,8 +695,8 @@ In R those apps are called **packages**.
 There are different sources to get packages from:
 
 - The [CRAN](https://cran.r-project.org/) which is the default source
-- [Bioconducor](http://www.bioconductor.org) which is another source specialized for biology packages
-- Directly from [github](https://github.com/)
+- [Bioconducor](http://www.bioconductor.org) which is another source specialized for biology packages (more information [here](./bioconductor.html))
+- Directly from [github](https://github.com/)(more information [here](./github.html))
 
 To install packages from [Bioconducor](http://www.bioconductor.org) and [github](https://github.com/) you will need to install specific packages from the [CRAN](https://cran.r-project.org/).