diff --git a/src/fontra/backends/designspace.py b/src/fontra/backends/designspace.py
index d154d78b8..0a9d570d2 100644
--- a/src/fontra/backends/designspace.py
+++ b/src/fontra/backends/designspace.py
@@ -518,6 +518,7 @@ def _newUFOLayer(self, glyphName, ufoPath, suggestedLayerName):
         existingLayerNames = set(reader.getLayerNames())
         ufoLayerName = suggestedLayerName
         count = 0
+        # getGlyphSet() will create the layer if it doesn't already exist
         while glyphName in self.ufoManager.getGlyphSet(ufoPath, ufoLayerName):
             # The glyph already exists in the layer, which means there is
             # a conflict. Let's make up a layer name in which the glyph