diff --git a/include/polarssl/ctr_drbg.h b/include/polarssl/ctr_drbg.h
index 4c0fc17..756b5a3 100644
--- a/include/polarssl/ctr_drbg.h
+++ b/include/polarssl/ctr_drbg.h
@@ -201,6 +201,7 @@
 /**
  * \brief               Write a seed file
  *
+ * \param ctx           CTR_DRBG context
  * \param path          Name of the file
  *
  * \return              0 if successful, 1 on file error, or
@@ -212,6 +213,7 @@
  * \brief               Read and update a seed file. Seed is added to this
  *                      instance
  *
+ * \param ctx           CTR_DRBG context
  * \param path          Name of the file
  *
  * \return              0 if successful, 1 on file error,