Some instructions for the knitting needles rol

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diff --git a/source/accessories/cases/knitting_needles_roll/index.rst b/source/accessories/cases/knitting_needles_roll/index.rst
index cb5f2b6..20b29a4 100644
--- a/source/accessories/cases/knitting_needles_roll/index.rst
+++ b/source/accessories/cases/knitting_needles_roll/index.rst
@@ -3,3 +3,110 @@ Knitting Needles Roll
 
 This is a fabric roll to store knitting needles, designed to fit
 precisely needles of known sizes.
+
+Materials
+---------
+
+Fabric
+^^^^^^
+
+* Scraps or ~25 cm sturdy printed cotton for the outer layer.
+* Scraps or ~25 cm stable but soft cotton for the lining.
+
+Notions
+^^^^^^^
+
+* Bias tape, 1.5 cm wide when folded: 
+* Ribbon
+* Sewing thread
+
+
+Pattern
+-------
+
+The pattern is made of simple rectangles; to make a roll that precisely
+fit a set of DPN you can use the following python code: enter the sizes
+in mm of the needles you want to fit as a tuple, e.g.::
+
+   > sizes = (
+       2.00, 2.25, 2.50, 2.75,
+       3.00, 3.25, 3.50, 3.75,
+       4.00, 4.50, 5.00, 5.50,
+       6.00, 6.50, 7.00, 8.00
+   )
+
+and then calculate the sizes of the slots and the width of the finished
+roll::
+
+   > [math.ceil(s * 5 / 5) * 5 for s in sizes]
+
+   [10, 15, 15, 15, 15, 20, 20, 20, 20, 25, 25, 30, 30, 35, 35, 40]
+
+   > sum([math.ceil(s * 5 / 5) * 5 for s in sizes]) + 30
+
+   400
+
+And the height of the roll should be the height of the needles, plus 4
+cm (e.g. for 20 cm needles it will be 24 cm).
+
+The part of lining that holds the needles will have to be wider:
+calculate the slots and total width with the following python code::
+
+   > [math.ceil(s * 7 / 5) * 5 for s in sizes]
+
+   [15, 20, 20, 20, 25, 25, 25, 30, 30, 35, 35, 40, 45, 50, 50, 60]
+
+   > sum([math.ceil(s * 7 / 5) * 5 for s in sizes]) + 30
+
+   555
+
+its height, finished, should be 3/4 of the height of the full roll (in
+our example 18 cm).
+
+Finally, the finished top flap should be 3 cm less than the width of the
+full roll, with 1 cm sewing allowance on the sides, and 1/3 of the
+height of the full roll, in our example 37 cm × 8 cm.
+
+Cut the following pieces:
+
+* base: cut 1 in fabric and 1 in lining, as wide and as tall as the
+  base, calculated above (e.g. 40 cm × 24 cm); 
+* needle holder: cut 1 in lining, as wide as calculated above and twice
+  as tall (e.g. 55.5 cm × 36 cm);
+* top flap: cut 1 in lining, as wide as calculated above plus 1 cm
+  sewing allowance *per side* and twice as tall (e.g. 39 cm × 16 cm.
+
+Instructions
+------------
+
+Fold the needle holder in half, wrong sides facing, press.
+
+Mark with chalk or a vanishing pen the channels measured above on the
+lining base and on the needle holder; 
+
+Place the lining base with the right side on top, and carefully align
+the needle holder over it such that its long raw edge (opposite to the
+fold) is aligned to the base, and the center seam matches. Pin in place
+and sew the center seam.
+
+Moving towards the sides, align each seam between the base and the
+needle holder, pin, sew, and then work on the next seam. At the end the
+short sides of the needle holder should match the short sides of the
+base.
+
+Make a box pleat at the bottom of each channel, pin them and sew along
+the long raw edge, about 1 cm from it.
+
+Prepare the top flap: turn it with right sides facing and sew the short
+sides with 1 cm allowance. Clip the corners, turn inside out and press.
+
+Attach a piece of ribbon to the fabric base, close (about 3 cm) to the
+center of one of the short edges, and any label or embellishment you
+want to add to the top.
+
+Place the base fabric and base lining + needle holder wrong sides
+together, sew along the sides and bottom edge, about 1 cm from it, being
+careful not to sew the ribbon. Place the top flap centered on the top
+side of the lining, and sew also the top edge 1 cm from it.
+
+