diff --git a/tracking/animate_alg.py b/tracking/animate_alg.py
index 4fd0abd..879b12c 100644
--- a/tracking/animate_alg.py
+++ b/tracking/animate_alg.py
@@ -25,6 +25,8 @@ def update_line(num, iterator, line, prev_groups):
     line.set_offsets(offsets)
     intens = np.array([meas[0] for meas in scan])
     line.set_array(intens)
+    # Set the colour matrix: Just set the colours to 2 * np.pi * group number (for every group number)
+    # line.set_color()
     return line,
 
 class Bunch: