data update

docs/ships/_index.md

@@ -30,6 +30,12 @@ Ships are built in Shipyards. Construction consumes resources and time.
 - [Scorpio](./modules/scorpio.md) - Side-mounted high-damage spears
 - [Onager](./modules/onager.md) - Forward catapult, long range
 
+## Captains
+
+Each ship has one captain slot for equipping specialist items that provide various bonuses.
+
+See [Captains](./captains.md) for the complete list of captain items organized by rarity and category.
+
 ## Ship Design Slots
 
 - Save up to 2 custom designs per hull per shipyard (6 total)