diff --git a/AUTHORS.md b/AUTHORS.md
index cb6b217bcfddb4df858a05ffc8c5252ccb366f19..063d74fcb2359a74d19db58255a0738edb5a20a5 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -16,6 +16,7 @@ The following people contributed to making of these lecture notes:
 * Lex Huismans
 * Gian de Bruin
 * Lars kleyn Winkel
+* Kostas Vilkelis
 
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