diff --git a/docs.it4i/software/tools/singularity.md b/docs.it4i/software/tools/singularity.md
index 721b8369ee0d2a6c75c4fe645a172f3d0c352596..03ecdb3b5ab17bedd66148c14f09bed21377da9d 100644
--- a/docs.it4i/software/tools/singularity.md
+++ b/docs.it4i/software/tools/singularity.md
@@ -80,7 +80,7 @@ your_local_machine $  docker ps -a
 your_local_machine $  docker commit 837a575cf8dc
 your_local_machine $  docker image  ls
 your_local_machine $  docker tag 4dd97cefde62 ubuntu_gvim
-your_local_machine $  docker save -o ubuntu_gvim.tar 4dd97cefde62 ubuntu_gvim
+your_local_machine $  docker save -o ubuntu_gvim.tar ubuntu_gvim
 ```
 
 copy the `ubuntu_gvim.tar` archive to IT4I supercomputers, convert to Singularity image and run: