api: More comprehensive documentation of INTERNAL_KIND. (#8400)

diff --git a/src/api/cpp/cvc5_kind.h b/src/api/cpp/cvc5_kind.h
index 9beca24ae5db589ed7ea4284561b7fd6cd21a8c7..598b65b6cf7ea227db613a1e024fbdde9f16434c 100644 (file)
--- a/src/api/cpp/cvc5_kind.h
+++ b/src/api/cpp/cvc5_kind.h
@@ -45,6 +45,10 @@ enum Kind : int32_t
   /**
    * Internal kind.
    *
+   * This kind serves as an abstraction for internal kinds that are not exposed
+   * via the API but may appear in terms returned by API functions, e.g.,
+   * when querying the simplified form of a term.
+   *
    * @note Should never be created via the API.
    */
   INTERNAL_KIND = -2,