diff --git a/telemetry/code/monitor/graph_plotter_rewrite.py b/telemetry/code/monitor/graph_plotter_rewrite.py
index 10e1950..1d23332 100755
--- a/telemetry/code/monitor/graph_plotter_rewrite.py
+++ b/telemetry/code/monitor/graph_plotter_rewrite.py
@@ -66,9 +66,9 @@ testseries = Series()
 plots = []         
 plots.append(Plot(testseries))
 
-def pollSerial(foo):
+def pollSerial(elapsed):
     """Check serial port for incoming data"""
-    # Note, foo seems to be a float
+    # Note, elapsed is time since last call of this function
     values = datafeed.readline().strip().split(", ")
     testseries.addpoint(values)
 
--
libgit2 0.21.2