diff --git a/openVulkanoCpp/IO/FsUtils.hpp b/openVulkanoCpp/IO/FsUtils.hpp
index 74952ce..e30756c 100644
--- a/openVulkanoCpp/IO/FsUtils.hpp
+++ b/openVulkanoCpp/IO/FsUtils.hpp
@@ -15,7 +15,7 @@ namespace OpenVulkano
 	{
 		size_t fileCount = 0, dirCount = 0;
 
-		size_t GetTotalEntryCount() const { return fileCount + dirCount; }
+		[[maybe_unused]] [[nodiscard]] size_t GetTotalEntryCount() const { return fileCount + dirCount; }
 
 		FsCount& operator +=(const FsCount& other)
 		{
@@ -23,6 +23,23 @@ namespace OpenVulkano
 			dirCount += other.dirCount;
 			return *this;
 		}
+
+		FsCount operator +(FsCount other)
+		{
+			return other += *this;
+		}
+
+		FsCount& operator -=(const FsCount& other)
+		{
+			fileCount -= other.fileCount;
+			dirCount -= other.dirCount;
+			return *this;
+		}
+
+		FsCount operator -(FsCount other)
+		{
+			return other -= *this;
+		}
 	};
 
 	struct FsUtils
@@ -35,12 +52,12 @@ namespace OpenVulkano
 
 		static bool IsTreeEmpty(const std::filesystem::path& dir);
 		
-		static ByteSize GetDirSize(const std::filesystem::path& dir);
+		[[nodiscard]] static ByteSize GetDirSize(const std::filesystem::path& dir);
 
-		static FsCount GetDirFileAndDirCount(const std::filesystem::path& dir);
+		[[nodiscard]] static FsCount GetDirFileAndDirCount(const std::filesystem::path& dir);
 		
-		static std::string ToValidFileName(std::string filename);
+		[[nodiscard]] static std::string ToValidFileName(std::string filename);
 
-		static std::vector<std::filesystem::path> FilesWithExtension(const std::filesystem::path& dir, std::string ext);
+		[[maybe_unused]] [[nodiscard]] static std::vector<std::filesystem::path> FilesWithExtension(const std::filesystem::path& dir, std::string ext);
 	};
 }