diff --git a/sys/include/crypto/chacha.h b/sys/include/crypto/chacha.h
index 5e01aa6339613e9d754deccc97009ff9dfd29bd2..398fd24c9de4f41f1388c5262837294e938ea48b 100644
--- a/sys/include/crypto/chacha.h
+++ b/sys/include/crypto/chacha.h
@@ -74,7 +74,7 @@ int chacha_init(chacha_ctx *ctx,
  * @details If you want to seek inside the cipher steam, then you have to
  *          update the clock in `ctx->state[13]:ctx->state[12]` manually.
  *
- * @warning You need to re-initialized the context with a new nonce after 2^64
+ * @warning You need to re-initialize the context with a new nonce after 2^64
  *          encrypted blocks, or the keystream will repeat!
  *
  * @param[in,out] ctx The ChaCha context
@@ -88,7 +88,7 @@ void chacha_keystream_bytes(chacha_ctx *ctx, void *x);
  * @details @p m is always the input regardless if it is the plaintext or ciphertext,
  *          and @p c vice verse.
  *
- * @warning You need to re-initialized the context with a new nonce after 2^64
+ * @warning You need to re-initialize the context with a new nonce after 2^64
  *          encrypted blocks, or the keystream will repeat!
  *
  * @param[in,out] ctx The ChaCha context.
diff --git a/sys/include/hashes/sha3.h b/sys/include/hashes/sha3.h
index 350924b17106e8669417be9eab1684a237676675..bc1b9e2d7c600b0906ac3a82493d532ad7373955 100644
--- a/sys/include/hashes/sha3.h
+++ b/sys/include/hashes/sha3.h
@@ -3,7 +3,7 @@
  * Joan Daemen, Michaël Peeters, Gilles Van Assche and Ronny Van Keer, hereby
  * denoted as "the implementer".
  *
- * RIOT-OS adaptaion by Mathias Tausig
+ * RIOT-OS adaptation by Mathias Tausig
  *
  * This software is released under the Creative Commons CC0 1.0 license.
  * To the extent possible under law, the implementer has waived all copyright