diff --git a/src/postprocessor/chainer.py b/src/postprocessor/chainer.py
index 8276f5411f3b14b1a709914838196e7e3c26d181..f5184d88a16784ee75f017a3d435e7feddfd856a 100644
--- a/src/postprocessor/chainer.py
+++ b/src/postprocessor/chainer.py
@@ -28,7 +28,7 @@ class Chainer(Signal):
         channel = [ch for ch in self.channels if re.match("GFP", ch)][0]
         if (
             channel == "GFPFast" and "mCherry" in self.channels
-        ):  # Use mCherry for Batman
+        ):  # Use mCherry for Batman if available
             channel = "mCherry"
 
         equivalences = {