1 files changed, 3 insertions, 2 deletions
diff --git a/TODO b/TODO
index 86f5779..dbb7f0c 100644
--- a/TODO
+++ b/TODO
@@ -42,6 +42,7 @@ crt0 with cpu cycle count printing
 BUFSIZ configurable by environment variable
 Rate limitation of I/O-functions configured by environment variables
 
-The width of intptr_t should be determined by sizeof(void*),
-and the width of size_t should be determined by sizeof(sizeof(0)).
+The width of intptr_t  should be determined by sizeof(void*),
+the width of size_t    should be determined by sizeof(sizeof(0)), and
+the width of ptrdiff_t should be determined by sizeof(NULL - NULL);