diff --git a/python/obitools3/dms/dms.pyx b/python/obitools3/dms/dms.pyx
index 06b93c9..a5e9bc5 100755
--- a/python/obitools3/dms/dms.pyx
+++ b/python/obitools3/dms/dms.pyx
@@ -259,7 +259,7 @@ cdef class DMS(OBIWrapper):
         for command in self.command_line_history:
             s+=b"#"
             s+=command[b"time"]
-            s+=b"\n"
+            s+=b"\nobi "
             s+=command[b"command"]
             s+=b"\n"
         return s