diff --git a/src/vim.h b/src/vim.h
index 54d507e..7d23986 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2739,4 +2739,9 @@
 // flags for equal_type()
 #define ETYPE_ARG_UNKNOWN 1
 
+// flags used by user commands and :autocmd
+#define UC_BUFFER	1	// -buffer: local to current buffer
+#define UC_VIM9		2	// {} argument: Vim9 syntax.
+
+
 #endif // VIM__H