diff --git a/involute_gears.scad b/involute_gears.scad
index e5b0f18..86528b1 100644
--- a/involute_gears.scad
+++ b/involute_gears.scad
@@ -427,9 +427,11 @@ module gear2d(
     clearance = undef,
     backlash = 0.0,
     interior = false,
+    mod,
     anchor = CENTER,
     spin = 0
 ) {
+    pitch = is_undef(mod) ? pitch : pitch_value(mod);
     path = gear2d(
         pitch = pitch,
         teeth = teeth,
diff --git a/version.scad b/version.scad
index 66213cb..b3a3b8b 100644
--- a/version.scad
+++ b/version.scad
@@ -8,7 +8,7 @@
 //////////////////////////////////////////////////////////////////////
 
 
-BOSL_VERSION = [2,0,458];
+BOSL_VERSION = [2,0,459];
 
 
 // Section: BOSL Library Version Functions