diff --git a/v0.5/Bill_of_materials.txt b/v0.5/Bill_of_materials.txt
index 040fb36..9599df0 100644
--- a/v0.5/Bill_of_materials.txt
+++ b/v0.5/Bill_of_materials.txt
@@ -85,11 +85,11 @@ Component                                  Quantity
 22.Transformer ETD49/25/16 Yoke                   2
 23.Transformer insulation paper 0.2mm (sheet)     1
 24.Wire AWG34/0.16mm dia., 2630V HY,       
-   12 layers, 0.2 isolation betwen layers
+   12 layers, 0.2 isolation between layers
    secondary: total number of wire turns       1875
    (about 156 turns per layer)
 25.Wire AWG18/1.02mm dia., 5130V HY, 
-   primary: total nubmer of wire turns            4
+   primary: total number of wire turns            4