diff --git a/apps/api/app/community_review.py b/apps/api/app/community_review.py
index 0be9abc..ab2619f 100644
--- a/apps/api/app/community_review.py
+++ b/apps/api/app/community_review.py
@@ -25,7 +25,18 @@ def map_observation(
         raise ExternalReviewError("published observation cannot be remapped")
     observation.fish = fish
     observation.waterbody = waterbody
-    observation.review_note = note
+    # A07: Explain the matching method in review_note
+    match_method = []
+    if observation.fish_external_id:
+        match_method.append(f"external_id={observation.fish_external_id}")
+    elif observation.fish_name:
+        match_method.append(f"name={observation.fish_name}")
+    if observation.waterbody_external_id:
+        match_method.append(f"wb_external_id={observation.waterbody_external_id}")
+    elif observation.waterbody_name:
+        match_method.append(f"wb_name={observation.waterbody_name}")
+    method_explanation = f"matched via {', '.join(match_method)}"
+    observation.review_note = f"{method_explanation}" + (f"; {note}" if note else "")
     observation.reviewed_at = datetime.now(timezone.utc)
     observation.status = "ready" if _complete(observation) else "mapped"
     _save_alias(session, observation, "fish", observation.fish_external_id or observation.fish_name, fish=fish)