diff --git a/src/include/tokenize.h b/src/include/tokenize.h
index 6310ab3..b0cfd36 100644
--- a/src/include/tokenize.h
+++ b/src/include/tokenize.h
@@ -12,9 +12,15 @@ enum class Type { Int };
 
 using TokenData = variant<int, string, Type>;
 
+struct CodePosition {
+    int line;
+    int column;
+};
+
 struct Token {
     TokenType type;
     TokenData data { };
+    CodePosition pos;
 };
 
 class TokenError : public runtime_error {
@@ -26,7 +32,7 @@ public:
 /*
     Parses a string into a vector of tokens
 */
-vector<Token> tokenize(string str);
+vector<Token> tokenize(vector<string> str);
 
 /*
     Format and print a Token