diff --git a/yaml/duplex.yaml b/yaml/duplex.yaml
index 86357ae..7e5e3d8 100644
--- a/yaml/duplex.yaml
+++ b/yaml/duplex.yaml
@@ -30,7 +30,6 @@ operations:
     output: ifc/duplex_merge.ifc
   - name: History
     command: history
-    output: OPERATIONS.md
     yaml_src: yaml/duplex.yaml
 
 dest: ifc/duplex_merge.ifc