diff --git a/build-envs/README b/build-envs/README
index fbfc5d09f5b9be0793a086f22faec0333b894259..234f7a826822a05acc1bf23e885adc30771bf6ba 100644
--- a/build-envs/README
+++ b/build-envs/README
@@ -24,7 +24,7 @@ Running things by hand
 ----------------------
 
   $ docker pull registry.gitlab.com/cerl/maestro/maestro-core/buildenv/debian
-  $ docker run -i -t registry.gitlab.com/cerl/maestro/maestro-core/buildenv/debian /bin/bash 
+  $ docker run --ulimit memlock=133000:133000 -i -t registry.gitlab.com/cerl/maestro/maestro-core/buildenv/debian /bin/bash 
   # now you have a shell in the docker container that is currently used on gitlab for CI
   $ mkdir /builds
   $ cd /builds