diff --git a/modules/taxonomy/taxonomy.module b/modules/taxonomy/taxonomy.module
index 4478e066b328f9c62fc1510f15c1b267f12ad6f5..653184cce08402eb1a807c1158f0b13b691403fa 100644
--- a/modules/taxonomy/taxonomy.module
+++ b/modules/taxonomy/taxonomy.module
@@ -1178,6 +1178,35 @@ function taxonomy_get_term($tid) {
   return $terms[$tid];
 }
 
+/**
+ * Create a select form element for a given taxonomy vocabulary.
+ *
+ * NOTE: This function expects input that has already been sanitized and is
+ * safe for display. Callers must properly sanitize the $title and
+ * $description arguments to prevent XSS vulnerabilities.
+ *
+ * @param $title
+ *   The title of the vocabulary. This MUST be sanitized by the caller.
+ * @param $name
+ *   Ignored.
+ * @param $value
+ *   The currently selected terms from this vocabulary, if any.
+ * @param $vocabulary_id
+ *   The vocabulary ID to build the form element for.
+ * @param $description
+ *   Help text for the form element. This MUST be sanitized by the caller.
+ * @param $multiple
+ *   Boolean to control if the form should use a single or multiple select.
+ * @param $blank
+ *   Optional form choice to use when no value has been selected.
+ * @param $exclude
+ *   Optional array of term ids to exclude in the selector.
+ * @return
+ *   A FAPI form array to select terms from the given vocabulary.
+ *
+ * @see taxonomy_form()
+ * @see taxonomy_form_term()
+ */
 function _taxonomy_term_select($title, $name, $value, $vocabulary_id, $description, $multiple, $blank, $exclude = array()) {
   $tree = taxonomy_get_tree($vocabulary_id);
   $options = array();