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diff --git a/TODO.txt b/TODO.txt
index f6a0b10..c507479 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -39,6 +39,12 @@ switch. Here NISS may be useful.
 * improve light solver with no table; consider using a small, hard-coded
   table, e.g. H48 corner table?
 
+## ARM NEON intrinsics and other architectures
+
+* For ARM: use two uint8x16_t (or uint8x16x2_t) and vqtbl* instructions;
+  see https://developer.arm.com/architectures/instruction-sets/intrinsics
+* Implement also SSE? Why not...
+
 ## Optimizations
 
 ### General things