1 files changed, 17 insertions, 1 deletions
diff --git a/docs/application/interface.md b/docs/application/interface.md
index 5acfba7..e1c947a 100644
--- a/docs/application/interface.md
+++ b/docs/application/interface.md
@@ -41,10 +41,26 @@ typedef struct {
     kpl_interface *interflace;
 } kpl_class;
 
+typedef enum : uint8_t {
+    KPL_STATUS_ERROR,
+    KPL_STATUS_VALUE,
+    KPL_STATUS_NULL,
+    KPL_STATUS_DONE
+} kpl_status;
+
 typedef struct {
-    any value, info;
+    any value;
+    kpl_status status;
 } kpl_result;
 
+kpl_result kpl_result_error(error *er);
+
+kpl_result kpl_result_value(any value);
+
+kpl_result kpl_result_null(void);
+
+kpl_result kpl_result_done(void);
+
 typdef struct {
     uint16_t slab_index, array_index;
 } kpl_ptr;