diff --git a/src/vram_mgr.h b/src/vram_mgr.h
index 5ed3ac3..0ec18f2 100644
--- a/src/vram_mgr.h
+++ b/src/vram_mgr.h
@@ -1,3 +1,12 @@
+/**
+ * @file vram_mgr.h
+ * @brief VRAM Manager for OSLib
+ * 
+ * This header file defines the functions and macros for managing VRAM (Video RAM) in OSLib.
+ * It includes functions for initializing the VRAM manager, allocating and freeing blocks of VRAM,
+ * and setting parameters for VRAM management.
+ */
+
 #ifndef _OSL_VRAM_MGR_H_
 #define _OSL_VRAM_MGR_H_
 
@@ -5,21 +14,81 @@
 extern "C" {
 #endif
 
-#define OSL_VRAM_SIZE	(2 << 20)
-#define OSL_VRAM_BASE	(0x40000000)
-#define OSL_VRAM_END	(OSL_VRAM_BASE + OSL_VRAM_SIZE)
+/**
+ * @def OSL_VRAM_SIZE
+ * @brief Defines the size of the VRAM (2 MB).
+ */
+#define OSL_VRAM_SIZE   (2 << 20)
+
+/**
+ * @def OSL_VRAM_BASE
+ * @brief Defines the base address of the VRAM.
+ */
+#define OSL_VRAM_BASE   (0x40000000)
+
+/**
+ * @def OSL_VRAM_END
+ * @brief Defines the end address of the VRAM.
+ */
+#define OSL_VRAM_END    (OSL_VRAM_BASE + OSL_VRAM_SIZE)
 
+/**
+ * @brief Global flag indicating whether the VRAM manager is in use.
+ * 
+ * This flag is set to non-zero if the VRAM manager is initialized and in use.
+ */
 extern int osl_useVramManager;
+
+/**
+ * @brief Pointer to the current VRAM allocation pointer.
+ * 
+ * This pointer keeps track of the current position in VRAM where the next allocation can be made.
+ */
 extern u32 osl_currentVramPtr;
 
+/**
+ * @brief Initializes the VRAM manager.
+ * 
+ * This function initializes the VRAM manager, setting up the necessary internal structures and
+ * pointers for VRAM management.
+ */
 extern void oslVramMgrInit();
+
+/**
+ * @brief Allocates a block of VRAM.
+ * 
+ * This function allocates a block of VRAM of the specified size.
+ * 
+ * @param blockSize The size of the block to allocate, in bytes.
+ * @return A pointer to the allocated block of VRAM, or NULL if the allocation fails.
+ */
 extern void *oslVramMgrAllocBlock(int blockSize);
+
+/**
+ * @brief Frees a previously allocated block of VRAM.
+ * 
+ * This function frees a block of VRAM that was previously allocated using oslVramMgrAllocBlock().
+ * 
+ * @param blockAddress The address of the block to free.
+ * @param blockSize The size of the block to free, in bytes.
+ * @return 0 if the block was successfully freed, or a negative value if an error occurred.
+ */
 extern int oslVramMgrFreeBlock(void *blockAddress, int blockSize);
+
+/**
+ * @brief Sets the parameters for the VRAM manager.
+ * 
+ * This function sets the start address and size for VRAM management. It can be used to
+ * reconfigure the VRAM manager if necessary.
+ * 
+ * @param adrStart The start address for VRAM management.
+ * @param size The size of the VRAM area to manage, in bytes.
+ * @return 0 if the parameters were successfully set, or a negative value if an error occurred.
+ */
 extern int oslVramMgrSetParameters(void *adrStart, int size);
 
 #ifdef __cplusplus
 }
 #endif
 
-#endif
-
+#endif /* _OSL_VRAM_MGR_H_ */