diff --git a/builtins.c b/builtins.c
index 0b8cded..f3afd8f 100644
--- a/builtins.c
+++ b/builtins.c
@@ -37,11 +37,14 @@ func_arithmetic(lisp_function_gt_eq, >=);
 
 int lisp_function_println(Nodes args, Scopes *scopes, Node *result) {
     if (args.count != 1) {
-        printf("'+' expects one argument!\n");
+        printf("'println' expects one argument!\n");
         return 1;
     }
 
-    eval_one(args.items[0], scopes, result);
+    int ret = eval_one(args.items[0], scopes, result);
+    if (ret != 0)
+        return ret;
+
     node_print(*result);
     printf("\n");
 
diff --git a/lisp.c b/lisp.c
index 1234bfd..13b3995 100644
--- a/lisp.c
+++ b/lisp.c
@@ -1,12 +1,12 @@
 #include "lisp.h"
 
-static Scope globalScope = {0};
+static Scope global_scope = {0};
 
 static int scope_lookup(Scopes *scopes, Nob_String_View name, Node *result) {
     nob_da_foreach(Scope *, scope, scopes) {
-        nob_da_foreach(ScopeObject, scopeObject, *scope) {
-            if (nob_sv_eq(name, scopeObject->name)) {
-                *result = scopeObject->node;
+        nob_da_foreach(ScopeObject, scope_object, *scope) {
+            if (nob_sv_eq(name, scope_object->name)) {
+                *result = scope_object->node;
                 return 0;
             }
         }
@@ -39,26 +39,26 @@ static bool node_is_true(Node node) {
 
 void build_scopes(Scopes *scopes) {
     // clang-format off
-    scope_add_function(&globalScope, "+", lisp_function_add);
-    scope_add_function(&globalScope, "-", lisp_function_sub);
-    scope_add_function(&globalScope, "/", lisp_function_div);
-    scope_add_function(&globalScope, "*", lisp_function_mul);
-    scope_add_function(&globalScope, "%", lisp_function_mod);
-    scope_add_function(&globalScope, "=", lisp_function_eq);
-    scope_add_function(&globalScope, "<", lisp_function_lt);
-    scope_add_function(&globalScope, ">", lisp_function_gt);
-    scope_add_function(&globalScope, "<=", lisp_function_lt_eq);
-    scope_add_function(&globalScope, ">=", lisp_function_gt_eq);
+    scope_add_function(&global_scope, "+", lisp_function_add);
+    scope_add_function(&global_scope, "-", lisp_function_sub);
+    scope_add_function(&global_scope, "/", lisp_function_div);
+    scope_add_function(&global_scope, "*", lisp_function_mul);
+    scope_add_function(&global_scope, "%", lisp_function_mod);
+    scope_add_function(&global_scope, "=", lisp_function_eq);
+    scope_add_function(&global_scope, "<", lisp_function_lt);
+    scope_add_function(&global_scope, ">", lisp_function_gt);
+    scope_add_function(&global_scope, "<=", lisp_function_lt_eq);
+    scope_add_function(&global_scope, ">=", lisp_function_gt_eq);
 
-    scope_add_function(&globalScope, "println", lisp_function_println);
-    scope_add_function(&globalScope, "list", lisp_function_list);
-    scope_add_function(&globalScope, "append", lisp_function_append);
-    scope_add_function(&globalScope, "length", lisp_function_length);
-    scope_add_function(&globalScope, "null?", lisp_function_isnull);
-    scope_add_function(&globalScope, "builtins", lisp_function_builtins);
+    scope_add_function(&global_scope, "println", lisp_function_println);
+    scope_add_function(&global_scope, "list", lisp_function_list);
+    scope_add_function(&global_scope, "append", lisp_function_append);
+    scope_add_function(&global_scope, "length", lisp_function_length);
+    scope_add_function(&global_scope, "null?", lisp_function_isnull);
+    scope_add_function(&global_scope, "builtins", lisp_function_builtins);
     // clang-format on
 
-    nob_da_append(scopes, &globalScope);
+    nob_da_append(scopes, &global_scope);
 }
 
 const char *token_kind_name(TokenKind kind) {
@@ -103,12 +103,26 @@ void node_print(Node node) {
     }
 }
 
-void tokenize(Nob_String_View content, Tokens *tokens) {
+int tokenize(Nob_String_View content, Tokens *tokens) {
+    bool ignored = false;
     for (size_t i = 0; i < content.count; i++) {
         char c = content.data[i];
 
+        if (ignored) {
+            if (c == '\n')
+                ignored = false;
+            continue;
+        }
+
         int kind = -1;
         switch (c) {
+        case '/': {
+            if (i + 1 < content.count && content.items[i + 1] == '/') {
+                i++;
+                ignored = true;
+                continue;
+            }
+        } break;
         case '(': {
             kind = TOKEN_KIND_PAR_LEFT;
         } break;
@@ -156,6 +170,7 @@ void tokenize(Nob_String_View content, Tokens *tokens) {
             nob_da_append(tokens, tok);
         }
     }
+    return 0;
 }
 
 int parse_one(Tokens *tokens, Node *node) {
@@ -325,7 +340,7 @@ int eval_one(Node input, Scopes *scopes, Node *result) {
                 return ret;
             }
 
-            nob_da_foreach(ScopeObject, scope_object, &globalScope) {
+            nob_da_foreach(ScopeObject, scope_object, &global_scope) {
                 if (nob_sv_eq(scope_object->name, name_node.as_symbol)) {
                     scope_object->node = value;
                     *result = children->items[0 + 1];
@@ -335,7 +350,7 @@ int eval_one(Node input, Scopes *scopes, Node *result) {
 
             ScopeObject obj =
                 (ScopeObject){.name = name_node.as_symbol, .node = value};
-            nob_da_append(&globalScope, obj);
+            nob_da_append(&global_scope, obj);
             *result = children->items[0 + 1];
             return 0;
         }
diff --git a/lisp.h b/lisp.h
index 78f71b2..4f13394 100644
--- a/lisp.h
+++ b/lisp.h
@@ -77,7 +77,7 @@ const char *token_kind_name(TokenKind kind);
 void node_print(Node node);
 
 void build_scopes(Scopes *scopes);
-void tokenize(Nob_String_View content, Tokens *tokens);
+int tokenize(Nob_String_View content, Tokens *tokens);
 
 int parse_one(Tokens *tokens, Node *node);
 int parse(Tokens *tokens, Nodes *nodes);
diff --git a/main.c b/main.c
index 9d333ae..6a9a9c5 100644
--- a/main.c
+++ b/main.c
@@ -27,7 +27,8 @@ int main(int argc, char **argv) {
     }
 
     Tokens tokens = {0};
-    tokenize(view, &tokens);
+    if (tokenize(view, &tokens) != 0)
+        return 1;
 
 #if 0
     for (size_t i = 0; i < tokens.count; i++) {
diff --git a/test/comments.lisp b/test/comments.lisp
new file mode 100644
index 0000000..9d6ecdc
--- /dev/null
+++ b/test/comments.lisp
@@ -0,0 +1,3 @@
+// wadadada
+
+(list 1 2 3)