diff --git a/pandatool/src/win-stats/winStatsGraph.cxx b/pandatool/src/win-stats/winStatsGraph.cxx
index 7b753a159f..7db69cda00 100644
--- a/pandatool/src/win-stats/winStatsGraph.cxx
+++ b/pandatool/src/win-stats/winStatsGraph.cxx
@@ -156,7 +156,7 @@ set_time_units(int unit_mask) {
 //     Function: WinStatsGraph::set_scroll_speed
 //       Access: Public
 //  Description: Called when the user selects a new scroll speed from
-//               the moniotr pulldown menu, this should adjust the
+//               the monitor pulldown menu, this should adjust the
 //               speed for the graph to the indicated value.
 ////////////////////////////////////////////////////////////////////
 void WinStatsGraph::
diff --git a/pandatool/src/win-stats/winStatsStripChart.cxx b/pandatool/src/win-stats/winStatsStripChart.cxx
index 59f7a00e18..049b6312bb 100644
--- a/pandatool/src/win-stats/winStatsStripChart.cxx
+++ b/pandatool/src/win-stats/winStatsStripChart.cxx
@@ -142,11 +142,12 @@ set_time_units(int unit_mask) {
 //     Function: WinStatsStripChart::set_scroll_speed
 //       Access: Public
 //  Description: Called when the user selects a new scroll speed from
-//               the moniotr pulldown menu, this should adjust the
+//               the monitor pulldown menu, this should adjust the
 //               speed for the graph to the indicated value.
 ////////////////////////////////////////////////////////////////////
 void WinStatsStripChart::
 set_scroll_speed(float scroll_speed) {
+  // The speed factor indicates chart widths per minute.
   if (scroll_speed != 0.0f) {
     set_horizontal_scale(60.0f / scroll_speed);
   }