diff --git a/README.md b/README.md
index e06cfb90..e7035b49 100644
--- a/README.md
+++ b/README.md
@@ -164,6 +164,7 @@ a set of rules that precisely define a sequence of operations.
   * `B` [Rail Fence Cipher](src/algorithms/cryptography/rail-fence-cipher) - a transposition cipher algorithm for encoding messages
   * `B` [Caesar Cipher](src/algorithms/cryptography/caesar-cipher) - simple substitution cipher
   * `B` [Hill Cipher](src/algorithms/cryptography/hill-cipher) - substitution cipher based on linear algebra
+  * `B` [Vigenère cipher](src/algorithms/cryptography/vigenère-cipher) - uses multiple ceasar ciphers to encrypt the plaintext
 * **Machine Learning**
   * `B` [NanoNeuron](https://github.com/trekhleb/nano-neuron) - 7 simple JS functions that illustrate how machines can actually learn (forward/backward propagation)
   * `B` [k-NN](src/algorithms/ml/knn) - k-nearest neighbors classification algorithm