diff --git a/DAS/Arithmetic.md b/DAS/Arithmetic.md
index 254a1c6..fa656c1 100644
--- a/DAS/Arithmetic.md
+++ b/DAS/Arithmetic.md
@@ -39,3 +39,12 @@ Only valid for GCD = 1
 	1. $A = q_1 * B + r_1$
 	2. $B = q_2 * r_1 + r_2$
 	3. $r_1 = q_3 * r_2 + 1$
+
+2. **Unwrap**
+	1. $1 = r_1 - (q_3 * r_2)$ mit $r_2 = B - q_2 * r_1$
+	2. $1 = r_1 - (q_3 * (B - q_2 * r_1))$ mit $q_3$ ausmultiplizieren
+	3. $1 = (1 + q_3 * q_2) * r_1 - q_3 * B$  mit $r_1 = A - q_1 * B$
+	4. $1 = (1 + q_3 * q_2) * (A - q_1 * B) - q_3 * B$
+
+3. **Simplify to** $x * A + y * B$
+4. Coefficient of $A$ is the modular inverse
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