diff --git a/ase/include/ase/cmn/fio.h b/ase/include/ase/cmn/fio.h
index 0d33f183..c20953b4 100644
--- a/ase/include/ase/cmn/fio.h
+++ b/ase/include/ase/cmn/fio.h
@@ -65,22 +65,31 @@ extern "C" {
  * NAME
  *  ase_fio_open - open a file
  *
- * PARAMETERS
+ * DESCRIPTION
+ *  To open a file, you should set the flags with at least one of 
+ *  ASE_FIO_READ, ASE_FIO_WRITE, ASE_FIO_APPEND.
  * 
  * SYNOPSIS
  */
 ase_fio_t* ase_fio_open (
-	ase_mmgr_t* mmgr,
-	ase_size_t ext,
+	ase_mmgr_t*       mmgr,
+	ase_size_t        ext,
 	const ase_char_t* path,
-	int flags,
-	int mode
+	int               flags,
+	int               mode
 );
 /******/
 
+/****f* ase.fio/ase_fio_close
+ * NAME
+ *  ase_fio_close - close a file
+ * 
+ * SYNOPSIS
+ */
 void ase_fio_close (
 	ase_fio_t* fio
 );
+/******/
 
 ase_fio_t* ase_fio_init (
 	ase_fio_t* fio,
diff --git a/ase/lib/cmn/fio.c b/ase/lib/cmn/fio.c
index 25eb0989..57aaf5a5 100644
--- a/ase/lib/cmn/fio.c
+++ b/ase/lib/cmn/fio.c
@@ -139,21 +139,23 @@ ase_fio_t* ase_fio_init (
 	#endif
 		/*
 		 * rwa -> RDWR   | APPEND
-		 * ra  -> RDONLY | APPEND
+		 * ra  -> RDWR   | APPEND
 		 * wa  -> WRONLY | APPEND
 		 * a   -> WRONLY | APPEND
 		 */
-		if ((flags & ASE_FIO_READ) && 
-		    (flags & ASE_FIO_WRITE)) desired_access |= O_RDWR;
-		else if (flags & ASE_FIO_READ) desired_access |= O_RDONLY;
-		else if (flags & ASE_FIO_WRITE) desired_access |= O_WRONLY;
-
 		if (flags & ASE_FIO_APPEND) 
 		{
-			if (!(flags & ASE_FIO_READ) &&
-			    !(flags & ASE_FIO_WRITE)) desired_access |= O_WRONLY;
+			if ((flags & ASE_FIO_READ)) desired_access |= O_RDWR;
+			else desired_access |= O_WRONLY;
 			desired_access |= O_APPEND;
 		}
+		else
+		{
+			if ((flags & ASE_FIO_READ) && 
+			    (flags & ASE_FIO_WRITE)) desired_access |= O_RDWR;
+			else if (flags & ASE_FIO_READ) desired_access |= O_RDONLY;
+			else if (flags & ASE_FIO_WRITE) desired_access |= O_WRONLY;
+		}
 
 		if (flags & ASE_FIO_CREATE) desired_access |= O_CREAT;
 		if (flags & ASE_FIO_TRUNCATE) desired_access |= O_TRUNC;