diff --git a/TODO.md b/TODO.md
index 8d09da8..ff3099f 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,5 +1,6 @@
 ### TODO
 * implement analog mode (most significant mode bit is 1), where only complex values are the payload
 * re-encode preamble to use entire symbol to update the channel estimation
+* compute SNR per subchannel using sync and preamble and update with each symbol
 * re-encode entire message and output number of bitflips and real SNR