diff --git a/library/entropy_poll.h b/library/entropy_poll.h
index 3cfd4a4..be4943c 100644
--- a/library/entropy_poll.h
+++ b/library/entropy_poll.h
@@ -50,7 +50,7 @@
 /**
  * \brief           Entropy poll callback for a hardware source
  *
- * \warning         This is not provided by mbed TLS!
+ * \warning         This is not provided by Mbed TLS!
  *                  See \c MBEDTLS_ENTROPY_HARDWARE_ALT in mbedtls_config.h.
  *
  * \note            This must accept NULL as its first argument.