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diff --git a/TODO.md b/TODO.md
index 0184f0a..c5b71e9 100644
--- a/TODO.md
+++ b/TODO.md
@@ -76,6 +76,10 @@ Ongoing shader code hygiene for granular, reusable snippets.
 **Pending (lower priority):**
 - [ ] GBufferEffect: Pass 3 transparency (transp=0 placeholder)
 - [ ] GBufferEffect: `resize()` support
+- [ ] Web tool (`cnn_v3/tools/shaders.js`): `prev_cnn` always zero in both pack shaders
+  (`FULL_PACK_SHADER` line ~313 and simple pack line ~39 hardcode `prev=0`).
+  C++ `gbuf_pack.wgsl` reads a real `prev_cnn` texture (binding 6).
+  Fix: add a `prev` texture binding to both JS pack shaders and wire it up in `tester.js`.
 
 ## Future: CNN v3 "2D Mode" (G-buffer-free)