diff --git a/RuntimeEnvironments.md b/RuntimeEnvironments.md
index b61fe4b..7cd4079 100644
--- a/RuntimeEnvironments.md
+++ b/RuntimeEnvironments.md
@@ -12,4 +12,6 @@ seems to work.
 
 ## Java
 
-By default, we use a Groovy script that looks for a class with a `main` method and executes it for running Java programs. For this setup to work correctly, we need to set the `JAVA_HOME` environment variable and make sure that `$JAVA_HOME/jre/lib/amd64/jvm.cfg` is accessible from the isolate sandbox (the file can be a link to a file in a folder in `/etc`, which also needs to be bound to the sandbox).
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+By default, we use a Groovy script that looks for a class with a `main` method and executes it for running Java programs. For this setup to work correctly, we need to set the `JAVA_HOME` environment variable and make sure that `$JAVA_HOME/jre/lib/amd64/jvm.cfg` is accessible from the isolate sandbox. The file can be a link to a file in a folder in `/etc`, which also needs to be bound to the sandbox (it is not recommended to bind the whole `/etc/` folder into the sandbox).
+
+Also, some versions of `/usr/bin/groovy` use `ls` - make sure that it is accessible from the sandbox.
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