diff --git a/concept.md b/concept.md
index 2233605..afb18fe 100644
--- a/concept.md
+++ b/concept.md
@@ -33,6 +33,9 @@
     - [ ] purchases and failed purchases (no $) trigger emotions on the shopkeepers
     - [ ] text-boxes for greetings
 - [x] Inventory system
+  - [x] Sorting
+  - [x] Grouping
+  - [ ] Trash items
 - [ ] Way to sell harvested goods
 - [ ] Quests
   - [ ] Item-quests