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-rw-r--r--gerbonara/layers.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/gerbonara/layers.py b/gerbonara/layers.py
index 77ca064..552ac8b 100644
--- a/gerbonara/layers.py
+++ b/gerbonara/layers.py
@@ -518,7 +518,7 @@ class LayerStack:
return self.bounding_box(unit=unit, default=default)
def merge_drill_layers(self):
- target = ExcellonFile(comments='Drill files merged by gerbonara')
+ target = ExcellonFile(comments=['Drill files merged by gerbonara'])
for layer in self.drill_layers:
if isinstance(layer, GerberFile):