backport of commit e565ffe

website/content/docs/drivers/exec.mdx

@@ -32,7 +32,16 @@ The `exec` driver supports the following configuration in the job spec:
 - `command` - The command to execute. Must be provided. If executing a binary
   that exists on the host, the path must be absolute and within the task's
   [chroot](#chroot) or in a [host volume][] mounted with a
-  [`volume_mount`][volume_mount] block. If executing a binary that is downloaded
+  [`volume_mount`][volume_mount] block. The driver will make the binary
+  executable and will search, in order:
+
+  - The `local` directory with the task directory.
+  - The task directory.
+  - Any mounts, in the order listed in the job specification.
+  - The `usr/local/bin`, `usr/bin` and `bin` directories inside the task
+    directory.
+
+  If executing a binary that is downloaded
   from an [`artifact`](/docs/job-specification/artifact), the path can be
   relative from the allocation's root directory.