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diff --git a/TODOs.md b/TODOs.md
index ab3b5d3..6a1100a 100644
--- a/TODOs.md
+++ b/TODOs.md
@@ -1,5 +1,12 @@
 # Tasks
 
+## TODO Use POSIX `$(CFLAGS)` {#task-4686d9a5-3514-e7f2-25de-b3cf66199124}
+- TODO in 2021-06-06
+
+---
+
+The current values for `$(CFLAGS)` in the `Makefile` work on GCC, Clang, TinyCC, but not on POSIX `c99`.
+
 ## TODO Can't test getopt {#task-2c3021db-7ede-c835-691a-af240c11f883}
 - TODO in 2021-03-10