updated for version 7.0050
diff --git a/src/vim.h b/src/vim.h
index 9ffaf9f..6d2b249 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -604,6 +604,7 @@
#define BF_NEW_W 0x20 /* Warned for BF_NEW and file created */
#define BF_READERR 0x40 /* got errors while reading the file */
#define BF_DUMMY 0x80 /* dummy buffer, only used internally */
+#define BF_PRESERVED 0x100 /* ":preserve" was used */
/* Mask to check for flags that prevent normal writing */
#define BF_WRITE_MASK (BF_NOTEDITED + BF_NEW + BF_READERR)