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diff --git a/README.md b/README.md
index a064666..b58028e 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,7 @@ Options
 | -a    | --override_app | string | | An app name and a directory to override in the form appname:dir |
 | -c    | --config     | string  | ./relx.config | Config file path |
 |       | --overlay_vars     | string  |  | Path to a file of overlay variables |
+|       | --sys_config     | string  |  | Path to a file to use for sys.config |
 | -d    | --dev-mode     | boolean | false | Symlink all applications and configuration into the release instead of copying|
 Wiki
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