diff --git a/nx/include/switch/devices/fs_dev.h b/nx/include/switch/devices/fs_dev.h
index e2f08473..8ae40b9d 100644
--- a/nx/include/switch/devices/fs_dev.h
+++ b/nx/include/switch/devices/fs_dev.h
@@ -9,7 +9,15 @@
 /// Initializes the FS driver.
 Result fsdevInit(void);
 
-/// Enable/disable copy in fsdev_write
+/// Enable/disable copy in fsdev_write. This is disabled by default.
+/// If it is disabled, you will be unable to write from the following memory-regions(http://switchbrew.org/index.php?title=SVC#MemoryState):
+/// MemoryType_Io
+/// MemoryType_Normal
+/// MemoryType_*SharedMemory
+/// MemoryType_ThreadLocal
+/// MemoryType_IpcBuffer3
+/// MemoryType_KernelStack (This is not mapped in userland anyway)
+/// This same restriction applies with reading into the above memory, a file-read version of fsdevWriteSafe() is not available.
 void fsdevWriteSafe(bool enable);
 
 /// Exits the FS driver.
diff --git a/nx/source/devices/fs_dev.c b/nx/source/devices/fs_dev.c
index fa6e51e2..1cfc9d04 100644
--- a/nx/source/devices/fs_dev.c
+++ b/nx/source/devices/fs_dev.c
@@ -432,11 +432,11 @@ Result fsdevInit(void)
 /*! Enable/disable safe fsdev_write
  *
  *  Safe fsdev_write is disabled by default. If it is disabled, you will be
- *  unable to write from read-only buffers.
+ *  unable to write from certain memory-regions.
  *
  *  @param[in] enable Whether to enable
  */
-void fsdevWriteSafe(bool enable)//TODO: Is this really needed?
+void fsdevWriteSafe(bool enable)
 {
   if(enable)
     fsdev_devoptab.write_r = fsdev_write_safe;