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@@ -238,6 +238,13 @@ On plain POSIX sh.
 
 # Improvements
 
+## TODO Work on portability {#improvement-f7317d52-012d-7f94-e699-aec7c84329b0}
+- TODO in 2021-06-13
+
+---
+
+The best resource on portability is [Portability is Reliability](https://evan.nemerson.com/2021/05/04/portability-is-reliability/), by Evan Nemerson.
+
 ## TODO Learn about secure programming in C {#improvement-8dfd18cf-2c34-ee29-e6cd-53d300687789}
 - TODO in 2021-06-13