diff --git a/gamedir/Data-1.13/CTHConstants.ini b/gamedir/Data-1.13/CTHConstants.ini
index 3d255255d..3be44c68c 100644
--- a/gamedir/Data-1.13/CTHConstants.ini
+++ b/gamedir/Data-1.13/CTHConstants.ini
@@ -74,6 +74,11 @@ LASER_PERFORMANCE_BONUS_SCOPE = 10.0
 ; be 100% on target, regardless of aiming.
 ; Decreasing this value causes all shots to be more accurate. 
 DEGREES_MAXIMUM_APERTURE = 15
+; This option affects DEGREES_MAXIMUM_APERTURE for iron sights. If it is set to FALSE
+; the basic aperture will grow linearly to the distance to target (old behaviour).
+; If TRUE the aperture will use a curve to grow slower over distance making iron sights
+; more powerful over long distances.
+IRON_SIGHTS_MAX_APERTURE_USE_GRADIENT = FALSE
 
 ; The Range Coefficient works with the listed weapon range to determine the weapons
 ; maximum range.  Once a bullet reaches it's maximum range, gravity pulls it towards
diff --git a/gamedir/Data/CTHConstants.ini b/gamedir/Data/CTHConstants.ini
index 3d255255d..3be44c68c 100644
--- a/gamedir/Data/CTHConstants.ini
+++ b/gamedir/Data/CTHConstants.ini
@@ -74,6 +74,11 @@ LASER_PERFORMANCE_BONUS_SCOPE = 10.0
 ; be 100% on target, regardless of aiming.
 ; Decreasing this value causes all shots to be more accurate. 
 DEGREES_MAXIMUM_APERTURE = 15
+; This option affects DEGREES_MAXIMUM_APERTURE for iron sights. If it is set to FALSE
+; the basic aperture will grow linearly to the distance to target (old behaviour).
+; If TRUE the aperture will use a curve to grow slower over distance making iron sights
+; more powerful over long distances.
+IRON_SIGHTS_MAX_APERTURE_USE_GRADIENT = FALSE
 
 ; The Range Coefficient works with the listed weapon range to determine the weapons
 ; maximum range.  Once a bullet reaches it's maximum range, gravity pulls it towards