diff --git a/README.md b/README.md
index 781047149b2325d395181c9319121872cdd787b0..81be776ccd0ab16d20cab3b9b48473d66f731425 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,7 @@
 Tru <tru@pasteur.fr>
 
 (toy) docker image produced available at `registry-gitlab.pasteur.fr/tru/docker-ubuntu-lts18.04-miniconda-ci:latest`
+
+# singularity image building
+
+`singularity build docker-ubuntu-lts18.04-miniconda-ci.sif docker://registry-gitlab.pasteur.fr/tru/docker-ubuntu-lts18.04-miniconda-ci:latest`