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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -11,6 +11,8 @@
 - Static functions for private?
 - JSON: tagged union for memory, remove pointer and use bitflag
 - `valgrind --leak-check=full ./your_program`
+- assert with error msg?
+- negative numbers
 
 ## Resources