- * This returns false if we run out of memory, or (more normally) if that
- * string already appears in the map.
+ * This returns false if we run out of memory (errno = ENOMEM), or
+ * (more normally) if that string already appears in the map (EEXIST).
*
* Note that the pointer is placed in the map, the string is not copied. If
* you want a copy in the map, use strdup(). Similarly for the value.
*
* Note that the pointer is placed in the map, the string is not copied. If
* you want a copy in the map, use strdup(). Similarly for the value.