diff --git a/exercises/04/vslc/include/ir.h b/exercises/04/vslc/include/ir.h
index ca91204..0ba03a2 100644
--- a/exercises/04/vslc/include/ir.h
+++ b/exercises/04/vslc/include/ir.h
@@ -48,4 +48,8 @@ typedef struct s {
 #define LOCAL_BUCKET_SIZE           16
 
 #define DEFAULT_STRING_LIST_SIZE    8
-#define DEFAULT_NO_SCOPES           1
\ No newline at end of file
+#define DEFAULT_NO_SCOPES           1
+
+/* Helper functions */
+void print_global_tree(symbol_t* global);
+void insert_symbol(tlhash_t *hash_table, symbol_t* symbol);
\ No newline at end of file