diff --git a/docs/concept.md b/docs/concept.md
index 1fe776a..5b54296 100644
--- a/docs/concept.md
+++ b/docs/concept.md
@@ -2,7 +2,7 @@
 
 ## Overview
 
-A single-player asymmetric game inspired by DOTA's wave/tower structure, combined with a Factorio-style factory builder. The player builds a factory on an asteroid to supply shipyards that produce autonomous combat ships. Those ships fight off endless enemy waves advancing from the right. The goal is to survive as long as possible; elapsed time is always displayed.
+A single-player asymmetric game inspired by DOTA's wave/tower structure, combined with a Factorio-style factory builder. The player builds a factory on an asteroid to supply shipyards that produce autonomous combat ships. Those ships fight off endless enemy waves advancing from the right. Defeating enemies occasionally yields artifacts, which are used to upgrade the HQ; the goal is to upgrade the HQ enough to launch it into space, winning the game. Elapsed time is always displayed.
 
 ## Setting & Visuals
 
@@ -70,13 +70,19 @@ Two sources feed the same production tree:
 
 - The player is not forced to push; purely defensive play is valid.
 - Destroying enemy defence stations applies the push scaling multiplier to all future waves, extends the scrollable area, and places a new (stronger) set of stations at the new boundary.
-- Destroyed enemy defence stations drop ship schematics.
+- Destroyed enemy defence stations drop either a ship/module schematic or, occasionally, an artifact.
+
+## Win Condition
+
+- Artifacts are gathered by defeating enemy defence stations instead of taking a schematic reward.
+- Artifacts are used to upgrade the HQ. Once the HQ is upgraded enough, the player can launch it into space — this is how the game is won.
 
 ## Starting Conditions & Game Over
 
 - The player starts with the HQ and player defence stations pre-placed and a stock of building blocks; no other buildings are pre-placed.
 - There is a grace period before the first wave to allow initial setup.
 - If all ships and player defence stations are destroyed, enemies attack the HQ. The game is lost when the HQ is destroyed. Factory buildings are never targeted.
+- The game is won when the player launches the HQ into space (see Win Condition).
 
 ## Asteroid Expansion