diff --git a/docs/source/specifications/metadata.org b/docs/source/specifications/metadata.org
index eb053ae2c2f2748c6af223faded5543b8d74aebc..6618730c2dfb78e133a64cb62a07a9fd8b90c93a 100644
--- a/docs/source/specifications/metadata.org
+++ b/docs/source/specifications/metadata.org
@@ -26,11 +26,13 @@ Draft for recommended metadata for images to provide a standard interface for al
   Filter names. Useful when images are acquired with the same LED and filter but multiple voltage conditions.
 - tags : List[str]
   Tags associated with the experiment. Useful for semi-automated experiment exploration.
-
+- Experiment-wide groups: List[int]
+  List of groups for which each position belongs.
+- Group names: List[str]
+  List of groups
 * Optional
 - hardware information : Dict[str, str]
   Name of all hardware used to acquire images.
 - Acquisition software and version: Tuple[str,str]
 - Experiment start: date
 - Experiment end: date
-- Experiment-wide groups: List[int]