diff --git a/include/mbedtls/ecjpake.h b/include/mbedtls/ecjpake.h
index 59e80e5..8096848 100644
--- a/include/mbedtls/ecjpake.h
+++ b/include/mbedtls/ecjpake.h
@@ -189,7 +189,7 @@
  * \brief           Derive the shared secret
  *                  (TLS: Pre-Master Secret)
  *
- * \param ctx
+ * \param ctx       Context to use
  * \param buf       Buffer to write the contents to
  * \param len       Buffer size
  * \param olen      Will be updated with the number of bytes written