diff --git a/lib/hx509/doxygen.c b/lib/hx509/doxygen.c
index 15e173c46..488ae4b9b 100644
--- a/lib/hx509/doxygen.c
+++ b/lib/hx509/doxygen.c
@@ -51,6 +51,7 @@
  * - @ref page_ca
  * - @ref page_revoke
  * - @ref page_print
+ * - @ref page_env
  *
  * The project web page:
  * http://www.h5l.org/