diff --git a/.claude/skills/asset-gen/SKILL.md b/.claude/skills/asset-gen/SKILL.md
index d2f59fe..8aaaa2c 100644
--- a/.claude/skills/asset-gen/SKILL.md
+++ b/.claude/skills/asset-gen/SKILL.md
@@ -99,6 +99,38 @@ Use the stronger prompt pattern to keep the model on the coin base:
 If the model drifts (different edge style, wrong background), regenerate — the
 coin base consistency is critical for the set to look cohesive at 60x60.
 
+## PNG Output Directory Structure
+
+Generated PNGs are saved under `~/Pictures/mcp-images/`. Mirror the mod's
+`gfx/` directory structure so source PNGs are organized the same way as the
+final DDS files:
+
+```
+~/Pictures/mcp-images/
+  icons/modifiers/          → modifier icons (60x60)
+  icons/traits/             → trait icons (120x120)
+  icons/faith/              → faith icons (100x100)
+  icons/buildings/          → building icons (60x60)
+  icons/maa/                → MaA regiment icons (60x60)
+  icons/focuses/            → focus icons (140x140)
+  icons/schemes/            → scheme icons (120x120)
+  icons/casus_belli/        → casus belli icons (60x60)
+  illustrations/decisions/  → decision illustrations (1100x440)
+  event_backgrounds/        → event scene backgrounds (1592x848)
+  loading_screens/          → loading screens (3840x2160)
+  bookmarks/                → bookmark art (1920x1080)
+  frontend/                 → frontend/menu art (3840x2160)
+  coat_of_arms/             → CoA emblems (128x128)
+  lifestyles/               → lifestyle strips, sidebars, perk trees
+```
+
+Use the `fileName` parameter with the subdirectory path (e.g.,
+`icons/modifiers/modifier_foo.png`) to save directly into the right location.
+Do not save PNGs loose in the root `mcp-images/` directory.
+
+When regenerating an asset, overwrite the existing file — do not create
+versioned copies (`_v2`, `_v3`, etc.).
+
 ## DDS Conversion
 
 CK3 requires DDS format. After generating PNGs, convert using the format