diff --git a/src/fmt.zig b/src/fmt.zig
index 12873341325f96b75412121136c1d7dd263a8ea5..4a3c321877a3c3733e5e4e653e1bd0200769e06d 100644
--- a/src/fmt.zig
+++ b/src/fmt.zig
@@ -156,7 +156,7 @@ pub fn run(gpa: Allocator, arena: Allocator, args: []const []const u8) !void {
     }
 
     if (input_files.items.len == 0) {
-        fatal("expected at least one source file argument", .{});
+        fatal("expected at least one file or directory argument", .{});
     }
 
     var stdout_buffer: [4096]u8 = undefined;