diff --git a/library/entropy_poll.h b/library/entropy_poll.h
index 9edf1f1..aef1a09 100644
--- a/library/entropy_poll.h
+++ b/library/entropy_poll.h
@@ -51,7 +51,7 @@
  * \brief           Entropy poll callback for a hardware source
  *
  * \warning         This is not provided by mbed TLS!
- *                  See \c MBEDTLS_ENTROPY_HARDWARE_ALT in config.h.
+ *                  See \c MBEDTLS_ENTROPY_HARDWARE_ALT in mbedtls_config.h.
  *
  * \note            This must accept NULL as its first argument.
  */