diff --git a/ih/conf.py b/ih/conf.py
index d777e7626c6ae68b4d8b8c519ddffaacd0bd2ee8..01db04df782ba715f5a25512a7f4e8b2b72a0f7c 100644
--- a/ih/conf.py
+++ b/ih/conf.py
@@ -1274,6 +1274,9 @@ valid = {
             "--dimensions": {
                 "type": "exist"
             },
+            "--dimfromroi": {
+                "type": "string"
+            },
             "--pixels": {
                 "type": "exist"
             },