diff --git a/tools/src/dwarfsck_main.cpp b/tools/src/dwarfsck_main.cpp
index 2082c371..d88f4198 100644
--- a/tools/src/dwarfsck_main.cpp
+++ b/tools/src/dwarfsck_main.cpp
@@ -288,6 +288,7 @@ int dwarfsck_main(int argc, sys_char** argv, iolayer const& iol) {
 
     reader::filesystem_options fsopts;
 
+    // This is needed to report a correct original file system size.
     fsopts.metadata.enable_nlink = true;
     fsopts.metadata.check_consistency = check_integrity;
     fsopts.image_offset = reader::parse_image_offset(image_offset);