diff --git a/source/campaigns/editor/filters.rst b/source/campaigns/editor/filters.rst
index cf3d07f7d..259a6dc21 100644
--- a/source/campaigns/editor/filters.rst
+++ b/source/campaigns/editor/filters.rst
@@ -996,7 +996,8 @@ This example can be used in ``Email sending condition`` of Advocate Offer Email
 qr\_code
 ........
 
-Converts a string into a QR code image in SVG format.
+Converts a string into a QR code. By default, produces an image in SVG format. If ``png_base64`` format is specified,
+returns a source for an HTML element, containing a base64-encoded PNG image.
 
 .. code-block:: liquid
 
@@ -1006,7 +1007,8 @@ Converts a string into a QR code image in SVG format.
 
 It may take the following arguments:
 
-* ``xdim`` - the width of the narrowest bar in a barcode. Thicker bars are multiples of the xdim. Default value is ``4``.
+* ``xdim`` - the width of the cell in a QR code. Default value is ``4``.
+* ``format`` - custom format for the result. Only ``png_base64`` is supported.
 
 This filter generates a QR code that can be used to encode URLs, text, or coupon codes. The QR code is returned as an SVG image that can be directly embedded in HTML.
 
@@ -1018,6 +1020,12 @@ This filter generates a QR code that can be used to encode URLs, text, or coupon
      {{ coupon.code | qr_code: xdim: 6 }}
    </div>
 
+To return a QR code as a base64-encoded PNG that can be embedded in email body, use the custom format:
+
+.. code-block:: liquid
+
+   <img src="{{ coupon.code | qr_code: format: 'png_base64' }}" />
+
 |hr|
 
 rand\_by