-Creates a bundle for the specified target platform. The target
-must be a directory in ~/.mono/targets/ that contains a "mono"
-binary. You can fetch various targets using the --fetch-target
-command line option.
+Use this to request mkbundle generate a cross-compiled binary. It
+Creates a bundle for the specified target platform. The target must
+be a directory in ~/.mono/targets/ that contains an SDK installation
+as produced by the mono-package-runtime tool. You can get a list of
+the precompiled versions of the runtime using --list-targets and you
+can fetch a specific target using the --fetch-target command line
+option.
+.Sp
+This flag is mutually exclusive with
+.I --sdk
+which is used to specify an absolute path to resolve the Mono runtime
+from and the --runtime option which is used to manually construct the
+cross-platform package.