diff --git a/src/vim.h b/src/vim.h
index ce55514..6790a48 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -953,6 +953,7 @@
 #define READ_STDIN	0x04	/* read from stdin */
 #define READ_BUFFER	0x08	/* read from curbuf (converting stdin) */
 #define READ_DUMMY	0x10	/* reading into a dummy buffer */
+#define READ_KEEP_UNDO	0x20	/* keep undo info*/
 
 /* Values for change_indent() */
 #define INDENT_SET	1	/* set indent */
@@ -2174,4 +2175,9 @@
 #define VIF_FORCEIT		4	/* overwrite info already read */
 #define VIF_GET_OLDFILES	8	/* load v:oldfiles */
 
+/* flags for buf_freeall() */
+#define BFA_DEL		1	/* buffer is going to be deleted */
+#define BFA_WIPE	2	/* buffer is going to be wiped out */
+#define BFA_KEEP_UNDO	4	/* do not free undo information */
+
 #endif /* VIM__H */