diff --git a/README.markdown b/README.markdown
index 120633c61..c1e9a50a5 100644
--- a/README.markdown
+++ b/README.markdown
@@ -45,7 +45,7 @@ Slic3r current features are:
 * save configuration profiles;
 * center print around bed center point;
 * multiple solid layers near horizontal external surfaces;
-* ability to scale, rotate and multiply input object;
+* ability to scale, rotate and duplicate input object;
 * customizable initial and final GCODE (using command line only);
 * use different speed for bottom layer and perimeters;
 * experimental support for G2/G3 native arcs.
@@ -147,8 +147,8 @@ The author is Alessandro Ranellucci (me).
        Transform options:
         --scale             Factor for scaling input object (default: 1)
         --rotate            Rotation angle in degrees (0-360, default: 0)
-        --multiply-x        Number of items along X axis (1+, default: 1)
-        --multiply-y        Number of items along Y axis (1+, default: 1)
-        --multiply-distance Distance in mm between copies (default: 6)
+        --duplicate-x       Number of items along X axis (1+, default: 1)
+        --duplicate-y       Number of items along Y axis (1+, default: 1)
+        --duplicate-distance Distance in mm between copies (default: 6)
         
 
diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index e5b2126a7..256085e8e 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -83,8 +83,8 @@ our $skirt_distance     = 6;    # mm
 # transform options
 our $scale              = 1;
 our $rotate             = 0;
-our $multiply_x         = 1;
-our $multiply_y         = 1;
-our $multiply_distance  = 6;    # mm
+our $duplicate_x        = 1;
+our $duplicate_y        = 1;
+our $duplicate_distance = 6;    # mm
 
 1;
diff --git a/lib/Slic3r/Config.pm b/lib/Slic3r/Config.pm
index 79e3a764e..8db8a2dd4 100644
--- a/lib/Slic3r/Config.pm
+++ b/lib/Slic3r/Config.pm
@@ -136,16 +136,16 @@ our $Options = {
         label   => 'Rotate (°)',
         type    => 'i',
     },
-    'multiply_x' => {
-        label   => 'Multiply along X',
+    'duplicate_x' => {
+        label   => 'Copies along X',
         type    => 'i',
     },
-    'multiply_y' => {
-        label   => 'Multiply along Y',
+    'duplicate_y' => {
+        label   => 'Copies along Y',
         type    => 'i',
     },
-    'multiply_distance' => {
-        label   => 'Multiply distance',
+    'duplicate_distance' => {
+        label   => 'Distance between copies',
         type    => 'i',
     },
 };
@@ -272,17 +272,17 @@ sub validate {
     die "Invalid value for --scale\n"
         if $Slic3r::scale <= 0;
     
-    # --multiply-x
-    die "Invalid value for --multiply-x\n"
-        if $Slic3r::multiply_x < 1;
+    # --duplicate-x
+    die "Invalid value for --duplicate-x\n"
+        if $Slic3r::duplicate_x < 1;
     
-    # --multiply-y
-    die "Invalid value for --multiply-y\n"
-        if $Slic3r::multiply_y < 1;
+    # --duplicate-y
+    die "Invalid value for --duplicate-y\n"
+        if $Slic3r::duplicate_y < 1;
     
-    # --multiply-distance
-    die "Invalid value for --multiply-distance\n"
-        if $Slic3r::multiply_distance < 1;
+    # --duplicate-distance
+    die "Invalid value for --duplicate-distance\n"
+        if $Slic3r::duplicate_distance < 1;
 }
 
 1;
diff --git a/lib/Slic3r/GUI/SkeinPanel.pm b/lib/Slic3r/GUI/SkeinPanel.pm
index 53a7a7c22..f45382985 100644
--- a/lib/Slic3r/GUI/SkeinPanel.pm
+++ b/lib/Slic3r/GUI/SkeinPanel.pm
@@ -45,7 +45,7 @@ sub new {
         ),
         transform => Slic3r::GUI::OptionsGroup->new($self,
             title => 'Transform',
-            options => [qw(scale rotate multiply_x multiply_y multiply_distance)],
+            options => [qw(scale rotate duplicate_x duplicate_y duplicate_distance)],
         ),
     );
     $self->{panels} = \%panels;
diff --git a/lib/Slic3r/STL.pm b/lib/Slic3r/STL.pm
index bd6834e57..cc1d692ad 100644
--- a/lib/Slic3r/STL.pm
+++ b/lib/Slic3r/STL.pm
@@ -47,17 +47,17 @@ sub parse_file {
         $extents[$_][MAX] *= $Slic3r::scale;
     }
     
-    # multiply object
-    my @multiply_offset = (
-        (($extents[X][MAX] - $extents[X][MIN]) + $Slic3r::multiply_distance),
-        (($extents[Y][MAX] - $extents[Y][MIN]) + $Slic3r::multiply_distance),
+    # duplicate object
+    my @duplicate_offset = (
+        (($extents[X][MAX] - $extents[X][MIN]) + $Slic3r::duplicate_distance),
+        (($extents[Y][MAX] - $extents[Y][MIN]) + $Slic3r::duplicate_distance),
     );
-    $extents[X][MAX] += $multiply_offset[X] * ($Slic3r::multiply_x-1);
-    $extents[Y][MAX] += $multiply_offset[Y] * ($Slic3r::multiply_y-1);
+    $extents[X][MAX] += $duplicate_offset[X] * ($Slic3r::duplicate_x-1);
+    $extents[Y][MAX] += $duplicate_offset[Y] * ($Slic3r::duplicate_y-1);
     my @copies = ();
-    for (my $i = 0; $i < $Slic3r::multiply_x; $i++) {
-        for (my $j = 0; $j < $Slic3r::multiply_y; $j++) {
-            push @copies, [ $multiply_offset[X] * $i, $multiply_offset[Y] * $j ];
+    for (my $i = 0; $i < $Slic3r::duplicate_x; $i++) {
+        for (my $j = 0; $j < $Slic3r::duplicate_y; $j++) {
+            push @copies, [ $duplicate_offset[X] * $i, $duplicate_offset[Y] * $j ];
         }
     }
     
diff --git a/slic3r.pl b/slic3r.pl
index 8af77f704..bd245f714 100755
--- a/slic3r.pl
+++ b/slic3r.pl
@@ -66,9 +66,9 @@ GetOptions(
     # transform options
     'scale=f'               => \$Slic3r::scale,
     'rotate=i'              => \$Slic3r::rotate,
-    'multiply-x=i'          => \$Slic3r::multiply_x,
-    'multiply-y=i'          => \$Slic3r::multiply_y,
-    'multiply-distance=i'   => \$Slic3r::multiply_distance,
+    'duplicate-x=i'         => \$Slic3r::duplicate_x,
+    'duplicate-y=i'         => \$Slic3r::duplicate_y,
+    'duplicate-distance=i'  => \$Slic3r::duplicate_distance,
 );
 
 # load configuration
@@ -133,7 +133,7 @@ Usage: slic3r.pl [ OPTIONS ] file.stl
                         by all firmwares)
     
   Filament options:
-    --filament-diameter Diameter of your raw filament (default: $Slic3r::filament_diameter)
+    --filament-diameter Diameter in mm of your raw filament (default: $Slic3r::filament_diameter)
     --filament-packing-density
                         Ratio of the extruded volume over volume pushed 
                         into the extruder (default: $Slic3r::filament_packing_density)
@@ -184,9 +184,9 @@ Usage: slic3r.pl [ OPTIONS ] file.stl
    Transform options:
     --scale             Factor for scaling input object (default: $Slic3r::scale)
     --rotate            Rotation angle in degrees (0-360, default: $Slic3r::rotate)
-    --multiply-x        Number of items along X axis (1+, default: $Slic3r::multiply_x)
-    --multiply-y        Number of items along Y axis (1+, default: $Slic3r::multiply_y)
-    --multiply-distance Distance in mm between copies (default: $Slic3r::multiply_distance)
+    --duplicate-x       Number of items along X axis (1+, default: $Slic3r::duplicate_x)
+    --duplicate-y       Number of items along Y axis (1+, default: $Slic3r::duplicate_y)
+    --duplicate-distance Distance in mm between copies (default: $Slic3r::duplicate_distance)
     
 EOF
     exit ($exit_code || 0);