diff --git a/docs/about.md b/docs/about.md
index 447a98c..9d59a84 100644
--- a/docs/about.md
+++ b/docs/about.md
@@ -82,13 +82,13 @@ The strap is 2 m 34-wire flat cable connected to the cascade with 34-bin boxer c
### Motherboard
Motherboard is a separate PCB connected to the grip (with 4-wire cable), to the cascade (with 2-wire cable with XT60 connector) and to the shaper (with 4-wire cable). The main purpose of the motherboard is to orchestrate the functioning of O-ESD and to provide the user interface.

-All components of the motherboard except step-up transformer are available on the marker. The step-up transformer must be assembled per specifications.
+All components of the motherboard except step-up transformer are available on the market. The step-up transformer must be assembled per specifications.

-The transformer has the following roles:
+The transformer has the following roles:
*to accumulate energy while the switching transistor is in the on state and release that energy to the high-voltage cascade when the switching transistor goes to the off state;
*to provide step-up voltage transformation from the low-voltage input to the high-voltage cascade and
*to provide galvanic insulation between the low-voltage input and the high-voltage cascade.
-Windings
+
Windings
(1) The primary and the secondary are to be wound on the coil former.
(2) The total number of turns for the primary winding is 4.
(3) The total number of turns for the secondary winding is 1860, i.e., about 155 per layer, 12 layer in total.