diff --git a/include/mbedtls/hmac_drbg.h b/include/mbedtls/hmac_drbg.h
index 37702b5..f2cf2c0 100644
--- a/include/mbedtls/hmac_drbg.h
+++ b/include/mbedtls/hmac_drbg.h
@@ -204,7 +204,7 @@
                     size_t len );
 
 /**
- * \brief               Initilisation of simpified HMAC_DRBG (never reseeds).
+ * \brief               Initialisation of simplified HMAC_DRBG (never reseeds).
  *
  * This function is meant for use in algorithms that need a pseudorandom
  * input such as deterministic ECDSA.