diff --git a/ArduCopter/ArduCopter.pde b/ArduCopter/ArduCopter.pde
index 0009aa173b..e3a3debffb 100644
--- a/ArduCopter/ArduCopter.pde
+++ b/ArduCopter/ArduCopter.pde
@@ -752,7 +752,7 @@ static uint32_t condition_start;
 ////////////////////////////////////////////////////////////////////////////////
 // IMU variables
 ////////////////////////////////////////////////////////////////////////////////
-// Integration time for the gyros (DCM algorithm)
+// Integration time (in seconds) for the gyros (DCM algorithm)
 // Updated with the fast loop
 static float G_Dt = 0.02;