diff --git a/docs/updating.md b/docs/updating.md
index 997c0a9c8..5a48fc8ed 100644
--- a/docs/updating.md
+++ b/docs/updating.md
@@ -652,6 +652,7 @@ pages for more details on the input and output variable types.
 
 * pre v3.0dev2: device, group, mask = **plantcv.object_composition**(*img, contours, hierarchy, device, debug=None*)
 * post v3.0dev2: group, mask = **plantcv.object_composition**(*img, contours, hierarchy*)
+* post v4.0: DEPRECATED
 
 #### plantcv.opening