dockerTools: Add fakechroot to fakeRootCommands

1 files changed, 7 insertions, 1 deletions

diff --git a/doc/builders/images/dockertools.section.md b/doc/builders/images/dockertools.section.md
index bfe1d17a60674..af09f25222344 100644
--- a/doc/builders/images/dockertools.section.md
+++ b/doc/builders/images/dockertools.section.md
@@ -149,7 +149,13 @@ Create a Docker image with many of the store paths being on their own layer to i
 
 `fakeRootCommands` _optional_
 
-: Shell commands to run while creating the archive for the final layer in a fakeroot environment. Unlike `extraCommands`, you can run `chown` to change the owners of the files in the archive, changing fakeroot's state instead of the real filesystem. The latter would require privileges that the build user does not have. Static binaries do not interact with the fakeroot environment. By default all files in the archive will be owned by root.
+: Shell commands to run while creating the archive for the final layer in a fakeroot + fakechroot environment. Unlike `extraCommands`, you can run `chown` to change the owners of the files in the archive, changing fakeroot's state instead of the real filesystem. The latter would require privileges that the build user does not have. Static binaries do not interact with the fakeroot environment. By default all files in the archive will be owned by root.
+
+`enableFakechroot` _optional_
+
+: Whether to run in `fakeRootCommands` in `fakechroot`, making programs behave as though `/` is the root of the image being created, while files in the Nix store are available as usual. This allows most scripts that perform installation in `/` to work as expected. Considering that `fakechroot` is implemented via the same mechanism as `fakeroot`, it is not guaranteed to work and will not work for static binaries.
+
+    *Default:* `true` when built on Linux, `false` otherwise
 
 ### Behavior of `contents` in the final image {#dockerTools-buildLayeredImage-arg-contents}