diff --git a/src/BinaryIo/Writer.h b/src/BinaryIo/Writer.h
index 763622e..5d2b9f7 100644
--- a/src/BinaryIo/Writer.h
+++ b/src/BinaryIo/Writer.h
@@ -45,7 +45,9 @@ class Writer {
 
         auto position() -> std::int64_t;
 
+        [[nodiscard]]
         auto array() const -> Containers::ArrayView<const char>;
+        [[nodiscard]]
         auto arrayPosition() const -> std::size_t;
         bool flushToFile();
 
diff --git a/src/Configuration/Configuration.h b/src/Configuration/Configuration.h
index 79ec469..37161dd 100644
--- a/src/Configuration/Configuration.h
+++ b/src/Configuration/Configuration.h
@@ -28,30 +28,39 @@ class Configuration {
 
         ~Configuration();
 
+        [[nodiscard]]
         bool valid() const;
 
+        [[nodiscard]]
         auto lastError() const -> Containers::StringView;
 
         void save();
 
+        [[nodiscard]]
         auto swapInterval() const -> int;
         void setSwapInterval(int interval);
 
+        [[nodiscard]]
         auto fpsCap() const -> float;
         void setFpsCap(float cap);
 
+        [[nodiscard]]
         bool cheatMode() const;
         void setCheatMode(bool enabled);
 
+        [[nodiscard]]
         bool advancedMode() const;
         void setAdvancedMode(bool enabled);
 
+        [[nodiscard]]
         bool checkUpdatesOnStartup() const;
         void setCheckUpdatesOnStartup(bool mode);
 
+        [[nodiscard]]
         bool skipDisclaimer() const;
         void setSkipDisclaimer(bool mode);
 
+        [[nodiscard]]
         bool isRunningInWine() const;
         void setRunningInWine(bool wine);
 
diff --git a/src/GameObjects/Mass.h b/src/GameObjects/Mass.h
index 6a4390b..c876b5b 100644
--- a/src/GameObjects/Mass.h
+++ b/src/GameObjects/Mass.h
@@ -70,6 +70,7 @@ class Mass {
 
         auto state() -> State;
 
+        [[nodiscard]]
         bool dirty() const;
         void setDirty(bool dirty = true);
 
diff --git a/src/Gvas/File.h b/src/Gvas/File.h
index 0dce428..05fc255 100644
--- a/src/Gvas/File.h
+++ b/src/Gvas/File.h
@@ -34,7 +34,9 @@ class File {
     public:
         explicit File(Containers::String filepath);
 
+        [[nodiscard]]
         bool valid() const;
+        [[nodiscard]]
         auto lastError() const -> Containers::StringView;
 
         bool reloadData();
diff --git a/src/Managers/BackupManager.h b/src/Managers/BackupManager.h
index 292ee26..c87cb83 100644
--- a/src/Managers/BackupManager.h
+++ b/src/Managers/BackupManager.h
@@ -39,8 +39,10 @@ class BackupManager {
 
         void refresh();
 
+        [[nodiscard]]
         auto backups() const -> Containers::ArrayView<const Backup>;
 
+        [[nodiscard]]
         auto vfs() const -> const Vfs::Directory<Backup>&;
 
         bool create(const GameObjects::Profile& profile);
diff --git a/src/Managers/ProfileManager.h b/src/Managers/ProfileManager.h
index 8418ddf..e1ec0cd 100644
--- a/src/Managers/ProfileManager.h
+++ b/src/Managers/ProfileManager.h
@@ -29,6 +29,7 @@ class ProfileManager {
     public:
         explicit ProfileManager();
 
+        [[nodiscard]]
         auto ready() const -> bool;
         auto lastError() -> Containers::StringView;
 
diff --git a/src/Managers/StagedMassManager.h b/src/Managers/StagedMassManager.h
index 87b1630..66ae85a 100644
--- a/src/Managers/StagedMassManager.h
+++ b/src/Managers/StagedMassManager.h
@@ -33,7 +33,10 @@ class StagedMassManager {
 
         auto lastError() -> Containers::StringView;
 
+        [[nodiscard]]
         auto stagedMasses() const -> Containers::ArrayView<const StagedMass>;
+
+        [[nodiscard]]
         auto at(Containers::StringView filename) const -> const StagedMass&;
 
         void refresh();
diff --git a/src/Managers/Vfs/Directory.h b/src/Managers/Vfs/Directory.h
index afc8fd7..d85912a 100644
--- a/src/Managers/Vfs/Directory.h
+++ b/src/Managers/Vfs/Directory.h
@@ -44,6 +44,7 @@ class Directory {
         Directory(Directory<FileType>&& other) = default;
         Directory& operator=(Directory<FileType>&& other) = default;
 
+        [[nodiscard]]
         auto name() const -> Containers::StringView {
             return _name;
         }
diff --git a/src/UpdateChecker/UpdateChecker.h b/src/UpdateChecker/UpdateChecker.h
index 5da13dc..f67a302 100644
--- a/src/UpdateChecker/UpdateChecker.h
+++ b/src/UpdateChecker/UpdateChecker.h
@@ -35,12 +35,16 @@ class UpdateChecker {
 
         auto check() -> Result;
 
+        [[nodiscard]]
         auto error() const -> Containers::StringView;
 
+        [[nodiscard]]
         bool updateAvailable() const;
 
+        [[nodiscard]]
         auto version() const -> const Version&;
 
+        [[nodiscard]]
         auto downloadLink() const -> Containers::StringView;
 
     private: