diff --git a/element/border/lang/en/customcertelement_border.php b/element/border/lang/en/customcertelement_border.php
index 96338c0..c6098e7 100644
--- a/element/border/lang/en/customcertelement_border.php
+++ b/element/border/lang/en/customcertelement_border.php
@@ -25,4 +25,4 @@
 $string['pluginname'] = 'Border';
 $string['invalidwidth'] = 'The width has to be a valid number greater than 0.';
 $string['width'] = 'Width';
-$string['width_help'] = 'Width of the border.';
+$string['width_help'] = 'Width of the border in mm.';
diff --git a/element/image/lang/en/customcertelement_image.php b/element/image/lang/en/customcertelement_image.php
index d1d8b5f..659fca8 100644
--- a/element/image/lang/en/customcertelement_image.php
+++ b/element/image/lang/en/customcertelement_image.php
@@ -23,10 +23,10 @@
  */
 
 $string['height'] = 'Height';
-$string['height_help'] = 'Height of the image in the page. If equal to zero, it is automatically calculated.';
+$string['height_help'] = 'Height of the image in mm. If equal to zero, it is automatically calculated.';
 $string['image'] = 'Image';
 $string['invalidheight'] = 'The height has to be a valid number greater than or equal to 0.';
 $string['invalidwidth'] = 'The width has to be a valid number greater than or equal to 0.';
 $string['pluginname'] = 'Image';
 $string['width'] = 'Width';
-$string['width_help'] = 'Width of the image in the page. If equal to zero, it is automatically calculated.';
+$string['width_help'] = 'Width of the image in mm. If equal to zero, it is automatically calculated.';
diff --git a/lang/en/customcert.php b/lang/en/customcert.php
index f7e636a..44bf48b 100644
--- a/lang/en/customcert.php
+++ b/lang/en/customcert.php
@@ -80,9 +80,9 @@ $string['pluginname'] = 'Custom Certificate';
 $string['print'] = 'Print';
 $string['portrait'] = 'Portrait';
 $string['posx'] = 'Position X';
-$string['posx_help'] = 'This is the position in pixels from the top left corner you wish the element to display in the x direction.';
+$string['posx_help'] = 'This is the position in mm from the top left corner you wish the element to display in the x direction.';
 $string['posy'] = 'Postion Y';
-$string['posy_help'] = 'This is the position in pixels from the top left corner you wish the element to display in the y direction.';
+$string['posy_help'] = 'This is the position in mm from the top left corner you wish the element to display in the y direction.';
 $string['receiveddate'] = 'Received date';
 $string['report'] = 'Report';
 $string['save'] = 'Save';