1 files changed, 2 insertions, 0 deletions
diff --git a/src/lexer.zig b/src/lexer.zig
index 8586765..608b755 100644
--- a/src/lexer.zig
+++ b/src/lexer.zig
@@ -9,6 +9,7 @@ pub const Token = struct {
         right_paren,
         integer_literal,
         plus,
+        minus,
         invalid,
         eof,
     };
@@ -44,6 +45,7 @@ pub fn next(self: *Self) ?Token {
         ')' => self.create(.right_paren),
         '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' => self.integerLiteral(),
         '+' => self.create(.plus),
+        '-' => self.create(.minus),
         ' ' => {
             self.last_end = self.pos;
             continue :s (self.eat() orelse return self.create(.eof));