Index: docs/P3-UseCaseModel/UseCase0006.md
===================================================================
--- docs/P3-UseCaseModel/UseCase0006.md	(revision b715712c7d5d3ee27c932a8a9d8e0a2bc6e85127)
+++ docs/P3-UseCaseModel/UseCase0006.md	(revision 35bcb41d9597d97650b4e40110ab3f3842f3db89)
@@ -17,4 +17,6 @@
    SELECT symbol,
           quantity,
+          COALESCE(reserved_quantity,  0),
+          COALESCE(available_quantity, quantity),
           COALESCE(avg_price,      0),
           COALESCE(current_price,  0),
@@ -26,4 +28,8 @@
     ORDER BY symbol;
    ```
+
+   `reserved_quantity` is the amount committed to the Trader's own open sell
+   orders (see [UseCase0005](UseCase0005.md)); `available_quantity` is what is
+   actually free to sell right now.
 3. System displays the rows and a computed summary:
 
@@ -54,4 +60,6 @@
        c.symbol,
        h.quantity,
+       h.reserved_quantity,
+       (h.quantity - h.reserved_quantity)      AS available_quantity,
        h.avg_price,
        lp.price                                AS current_price,