diff --git a/src/scan.cpp b/src/scan.cpp
index d5a54eb..81c0561 100644
--- a/src/scan.cpp
+++ b/src/scan.cpp
@@ -52,6 +52,13 @@ vector<Token> scan(string s) {
 			} else {
 				printf("error on line %d", line), exit(1);
 			}
+		} else if (s[pt] == '/') {
+			if (pt + 1 < s.size() && s[pt + 1] == '/') {
+				for (pt += 2; pt < s.size() && s[pt] != '\n'; pt++) {}
+				continue;
+			} else {
+				printf("error on line %d", line), exit(1);
+			}
 		} else if (isalpha(s[pt]) || s[pt] == '_') {
 			size_t r = pt + 1;
 			while (r < s.size() && (isalpha(s[r]) || s[r] == '_' || isdigit(s[r]))) {