diff --git a/pyjecteur/common.py b/pyjecteur/common.py
index 3a989bd..31fa9a2 100644
--- a/pyjecteur/common.py
+++ b/pyjecteur/common.py
@@ -42,10 +42,13 @@ class InterpType(Enum):
     LINEAR = 2
 
 class Filling(Enum):
+    """
+    How we fill a bar when the color ratio is not a perfect match
+    """
 
-    VOID = 1
-    EXTREMA = 2
-    GREATEST = 3
+    VOID = 1     # Fill with a "void" color
+    EXTREMA = 2  # Repeat both extrema values
+    GREATEST = 3 # Repeat the longest color streaks 
 
 def blendLedBar(colors: List[Color], 
                 blending: Optional[InterpType] = InterpType.NEAREST,