* ::WIMLIB_UNMOUNT_FLAG_COMMIT. Neither of these flags affect read-only
* mounts.
* @param progress_func
- * Currently ignored, but may be used for a progress callback in the
- * future. Set to @c NULL.
+ * If non-NULL, a function that will be called periodically with the
+ * progress of the current operation.
*
* @return 0 on success; nonzero on error.
*