diff -r ec62453fc8a6 -r 1ecf4dbbc60c src/cx/string.h
--- a/src/cx/string.h	Fri Dec 20 21:25:33 2024 +0100
+++ b/src/cx/string.h	Sat Dec 21 21:03:28 2024 +0100
@@ -290,6 +290,8 @@
 
 /**
  * Returns the accumulated length of all specified strings.
+ * 
+ * If this sum overflows, errno is set to EOVERFLOW.
  *
  * \attention if the count argument is larger than the number of the
  * specified strings, the behavior is undefined.