diff --git a/api.rst b/api.rst
index 94ad7ce..05acafc 100644
--- a/api.rst
+++ b/api.rst
@@ -541,8 +541,8 @@ are described in :numref:`tab:valuetype`.
    |                             |      | This type is used to group logically related options.  A group option  |
    |                             |      | is in effect up to the point where another group option is encountered |
    |                             |      | (or up to the end of the option list, if there are no other group      |
-   |                             |      | options).  For group options, only members :member:`title` and         |
-   |                             |      | :member:`type` are valid in the option descriptor.                     |
+   |                             |      | options).  For group options, only members :member:`title`,            |
+   |                             |      | :member:`desc`, and :member:`type` are valid in the option descriptor. |
    +-----------------------------+------+------------------------------------------------------------------------+
 
 .. index:: SANE_Unit