diff --git a/yml/imsim.yaml b/yml/imsim.yaml
index 58039b31..319fe666 100644
--- a/yml/imsim.yaml
+++ b/yml/imsim.yaml
@@ -8036,7 +8036,7 @@ tables:
   - name: trail_flag_edge
     "@id": "#DiaSource.trail_flag_edge"
     datatype: boolean
-    description: This flag is set if a trailed source extends onto or past edge pixels.
+    description: This flag is set if a trailed source contains edge pixels.
     fits:tunit:
 - name: ForcedSourceOnDiaObject
   "@id": "#ForcedSourceOnDiaObject"