diff --git a/TODO b/TODO
index 2ef1122..4702203 100644
--- a/TODO
+++ b/TODO
@@ -3,6 +3,7 @@ Write a function to return a dictionary containing key-value pairs
 Write a Makefile. [done]
 Add octal escape support to echo.
 Rework yes(1) to buffer output. This achieves greater throughput per system call.
+Rewrite the buffering in cat(1) to use setvbuf
 
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 PROGS