diff --git a/headers/private/disk_scanner/fs.h b/headers/private/disk_scanner/fs.h
index 9ce59d8119..7b87fb55a8 100644
--- a/headers/private/disk_scanner/fs.h
+++ b/headers/private/disk_scanner/fs.h
@@ -8,7 +8,7 @@
 struct extended_partition_info;
 
 typedef bool (*fs_identify_hook)(int deviceFD,
-	struct extended_partition_info *partitionInfo);
+	struct extended_partition_info *partitionInfo, float *priority);
 
 typedef struct fs_module_info {
 	module_info			module;
@@ -35,6 +35,10 @@ typedef struct fs_module_info {
 	params:
 	deviceFD: a device FD
 	partitionInfo: the partition info
+	priority: Pointer to a float in which the priority of the FS shall be
+			  stored. Used in case several FS add-ons recognize the FS;
+			  then the module returning the highest priority is used.
+			  -1 <= *priority <= 1
 
 	Returns true, if successful (i.e. the FS was recognized), false otherwise.
 */