diff --git a/README.md b/README.md
index 3ba0cce09605ed0377473db39247ba9b7130de30..4881ae50f447fc0e36913a56b1dfe33f79b83d3d 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,7 @@ Non functional (expected values are $`5.085`$ and $`-0.1156`$)
 | R        |            3.5.1 | ggplot2 3.0.0 rmarkdown 1.10                                  | RStudio | Windows 7 x64                  | Identical                                | Identical                                 | Identical                    | Identical | Identical         | [html](src/R/Challenger.html)                                                                                                                                                                                                                                                                                                                                | ????        |
 | R        |            3.5.1 | ggplot2 3.1.0 rmarkdown 1.10                                  | RStudio | GNU/Linux Manjaro 4.18.17-1    | Identical                                | Identical                                 | Identical                    | Identical | Identical         | [Rmd](https://app-learninglab.inria.fr/gitlab/0ff5ec0ebf4e500d1aa4b14c0d8efd67/mooc-rr/blob/e4db1956911a37407fe8a0718a34d9ff4b3ee33b/module4/re-analyse_shuttle_sguyader.Rmd), [PDF](https://app-learninglab.inria.fr/gitlab/0ff5ec0ebf4e500d1aa4b14c0d8efd67/mooc-rr/blob/e4db1956911a37407fe8a0718a34d9ff4b3ee33b/module4/re-analyse_shuttle_sguyader.pdf) | S. Guyader  |
 | R        |            3.5.1 | ggplot2_3.0.0                                                 | org-mode | GNU/Linux OpenSuse Leap 15.0  | don't know                               | don't know                                | don't know                   | don't know | don't kn         | [org](https://app-learninglab.inria.fr/gitlab/moocrr-session1/moocrr-reproducibility-study/blob/master/src/R/challenger_R_org.org), [pdf](https://app-learninglab.inria.fr/gitlab/moocrr-session1/moocrr-reproducibility-study/blob/master/src/R/challenger_R_org.pdf)                                                                                       | JFM         |
+| R        |            3.5.1 | ggplot2 3.0.0 rmarkdown 1.10                                  | RStudio | Windows 7 x64                  | Identical                                | Identical                                 | Identical                    | Identical | Identical         | [html](src/R/study_vd.html)                                                                                                                                                                                                                                                                                                                                | V.Dordonnat        |
 | **Python** |                  |                                                               |         |                                |                                          |                                           |                              |           |                   |                                                                                                                                                                                                                                                                                                                                                            |             |
 | Python   |            3.6.4 | statsmodels 0.9.0 numpy 1.13.3 pandas 0.22.0 matplotlib 2.2.2 | Jupyter | Linux Ubuntu 4.4.0-116-generic | Identical                                | Identical                                 | Identical                    | Identical | Similar           | [ipynb](src/Python3/challenger.ipynb), [pdf](src/Python3/challenger_ubuntuMOOC_alegrand.pdf)                                                                                                                                                                                                                                                                 | A. Legrand  |
 | Python   |            3.6.4 | statsmodels 0.9.0 numpy 1.13.3 pandas 0.22.0 matplotlib 2.2.3 | Jupyter | Linux Ubuntu 4.4.0-116-generic | Identical                                | Identical                                 | Identical                    | Identical | Similar           | [ipynb](https://app-learninglab.inria.fr/gitlab/209efe97d845ea4b57491275c640a3d4/mooc-rr/blob/master/module4/challenger.ipynb), [pdf](https://app-learninglab.inria.fr/gitlab/209efe97d845ea4b57491275c640a3d4/mooc-rr/blob/master/module4/challenger-jupiter.pdf)                                                                                           | N. Maurin   |