diff --git a/src/tokens.cpp b/src/tokens.cpp
index b9535ff..6cb4eb2 100644
--- a/src/tokens.cpp
+++ b/src/tokens.cpp
@@ -159,13 +159,13 @@ namespace token {
                 i++; // Skip second "
                 tokens.push_back(token::Token{ token::Type::LiteralStr, content, meta + (content.size() + 2) });
             }
-            else if (std::isalpha(c)) {
+            else if (std::isalpha(c) || c == '_') {
                 std::string content{};
                 do {
                     content += c;
                     if ((i + 1) >= text_length) break;
                     c = text[++i];
-                } while (std::isalnum(c));
+                } while (std::isalnum(c) || c == '_');
 
                 token::Type type = token::Type::Ident;
                 if (content == "return") {
diff --git a/test.c b/test.c
index 8ad90e2..7d3bb52 100644
--- a/test.c
+++ b/test.c
@@ -6,13 +6,13 @@ int fibonacci(int n) {
     return fibonacci(n - 1) + fibonacci(n - 2);
 }
 
-void modifyvalue(char* otus) {
+void modify_value(char* otus) {
     *otus = 20;
 }
 
 int main() {
     printf("10th fibonacci number is %d!", fibonacci(10));
     char res = 10;
-    modifyvalue(&res);
+    modify_value(&res);
     return res;
 }
\ No newline at end of file