diff --git a/test_data/cluster/DCLU b/test_data/cluster/DCLU
index dd6d963fb87a48906e1958603fcd6d45a18c4471..f819ca7377a0dbba0071e92e430d794adb71510d 100644
--- a/test_data/cluster/DCLU
+++ b/test_data/cluster/DCLU
@@ -7,3 +7,4 @@
  3.40D01  1.50D01  4.90D01  5.00D00  5.00D00  1.00D01
  0
 0
+# This is a comment line