diff --git a/renderers/vulkan/modules/control.cppm b/renderers/vulkan/modules/control.cppm
index 357fe19..1a8b65d 100644
--- a/renderers/vulkan/modules/control.cppm
+++ b/renderers/vulkan/modules/control.cppm
@@ -13,19 +13,47 @@ import vulkan_hpp;
 
 export namespace vulkan_render {
 
+    /**
+     * Command to perform an action on GPU such as rendering, copying, etc.
+     *
+     * Usage:
+     * 1. instantiate command from pool.
+     * 1. call vulkan_render::Command::Begin.
+     * 1. call Vulkan API with vulkan_render::Command::handle.
+     * 1. call vulkan_render::Command::Submit.
+     */
     class Command {
     public:
         const Context &context;
         vk::raii::CommandBuffer handle;
 
+        /**
+         * Constructs wrapper for existing command.
+         * @param context Vulkan context with ready device.
+         * @param buffer source command buffer.
+         */
         Command(const Context &context, vk::raii::CommandBuffer&& buffer);
+        /**
+         * Instantiates command buffer.
+         * @param context Vulkan context with ready device.
+         * @param pool commands source.
+         */
         Command(const Context &context, const vk::raii::CommandPool &pool);
 
         Command(Command&&) noexcept = default;
         Command(const Command&) = delete;
         Command& operator=(const Command&) = delete;
 
+        /**
+         * Sets buffer in ready state to record command.
+         */
         void Begin() const;
+        /**
+         * Sends recorded command to GPU queue.
+         * @note vulkan_render::Command::Begin and
+         * vulkan_render::Command::handle methods should be called earlier.
+         * @param queue target.
+         */
         void Submit(const vk::raii::Queue &queue) const;
     };
 
@@ -41,17 +69,32 @@ export namespace vulkan_render {
         std::vector<Command> transferBuffers;
 
         /**
-         * Create pools and initialize all command buffers.
+         * Creates pools and initialize all command buffers.
          * @param context Vulkan context with ready device.
          * @param maxFramesInFlight amount of created buffers for each purpose.
          */
         RenderCommands(const Context &context, std::uint32_t maxFramesInFlight);
 
+        /**
+         * Transfers current buffer data from CPU to GPU.
+         * @param buffer target.
+         */
         void SubmitStagingBuffer(const BaseBuffer<BufferMode::STAGING_ACCESS> &buffer) const;
+        /**
+         * Updates texture with data from buffer.
+         * @param buffer source data.
+         * @param texture destination texture.
+         */
         void SubmitTexture(
             const BaseBuffer<BufferMode::STATIC> &buffer,
             const Texture<TextureMode::PARTIAL> &texture
         ) const;
+        /**
+         * Changes texture image layout using pipeline barrier.
+         * @param texture target.
+         * @param from current layout.
+         * @param to new layout.
+         */
         void TranslateTextureLayout(
             const Texture<TextureMode::PARTIAL> &texture,
             const vk::ImageLayout &from,
@@ -67,6 +110,9 @@ export namespace vulkan_render {
         );
     };
 
+    /**
+     * Controls synchronization between CPU and GPU using semaphores and fences.
+     */
     class SyncManager {
     public:
         const Context &context;
@@ -77,9 +123,32 @@ export namespace vulkan_render {
         std::vector<vk::raii::Fence> inFlightFences;
         std::vector<vk::Fence> imagesInFlight;
 
+        /**
+         * Inits synchronization objects for a given number of frames in flight.
+         * @param context Vulkan context with ready device.
+         * @param maxFramesInFlight maximum number of frames that may be processed concurrently.
+         * @param timeout timeout in nanoseconds for fence waiting.
+         */
         SyncManager(const Context &context, std::uint32_t maxFramesInFlight, std::uint64_t timeout);
+        /**
+         * Waits for the fence that guards the current frame submission to finish.
+         * @param currentFrame index of the current in-flight frame (0..maxFramesInFlight-1).
+         */
         void WaitInFlightFence(std::size_t currentFrame);
+        /**
+         * Waits for any previous frame fence that is still associated with a swapchain image,
+         * then associates the current frame fence with that image.
+         * @param currentFrame index of the current in-flight frame (0..maxFramesInFlight-1).
+         * @param imageIndex index of the swapchain image that is about to be acquired.
+         */
         void WaitImageInFlight(std::size_t currentFrame, std::uint32_t imageIndex);
+        /**
+         * Acquires the index of the next available swapchain image.
+         * @param swapchain source to acquire the image.
+         * @param currentFrame index of the current in-flight frame (0..maxFramesInFlight-1).
+         * @param[out] imageIndex index of acquired image.
+         * @return result code of operation.
+         */
         vk::Result AcquireNextImage(
             const Swapchain &swapchain,
             std::size_t currentFrame,