- * source parameter. The rest of the parameters are the same as
- * wimlib_add_image(). See the documentation for <b>imagex capture</b> for full
- * details on how this mode works. */
+ * source parameter of wimlib_add_image(). The rest of the parameters are the
+ * same as wimlib_add_image(). See the documentation for <b>imagex capture</b>
+ * for full details on how this mode works.
+ *
+ * Additional note: @a sources is not a @c const parameter and you cannot
+ * assume that its contents are valid after this function returns. You must
+ * save pointers to the strings in these structures if you need to free them
+ * later, and/or save copies if needed.
+ *
+ * In addition to the error codes that wimlib_add_image() can return,
+ * wimlib_add_image_multisource() can return ::WIMLIB_ERR_INVALID_OVERLAY
+ * when trying to overlay a non-directory on a directory or when otherwise
+ * trying to overlay multiple conflicting files to the same location in the WIM
+ * image. It will also return ::WIMLIB_ERR_INVALID_PARAM if
+ * ::WIMLIB_ADD_IMAGE_FLAG_NTFS was specified in @a add_image_flags but there
+ * was not exactly one capture source with the target being the root directory.
+ * (In this respect, there is no advantage to using
+ * wimlib_add_image_multisource() instead of wimlib_add_image() when requesting
+ * NTFS mode.) */