diff --git a/exercises/02/vslc/include/ir.h b/exercises/02/vslc/include/ir.h
new file mode 100644
index 0000000..fe2fbf4
--- /dev/null
+++ b/exercises/02/vslc/include/ir.h
@@ -0,0 +1,23 @@
+#ifndef IR_H
+#define IR_H
+
+/* This is the tree node structure */
+typedef struct n {
+    node_index_t type;      // Type of the node
+    void *data;             // Pointer to associated data
+    struct s *entry;        // Pointer to symtab entry (ignore for now)
+    uint64_t n_children;    // Number of child nodes
+    struct n **children;    // Array of n_children child nodes
+} node_t;
+
+/**Export the initializer function, it is needed by the parser
+ * @param *nd node to initialize
+ * @param type type of node (see nodetype.h)
+ * @param *data associated data. Declared void to allow any type
+ * @param n_children number of children
+ * @param ... variable argument list of child nodes (node_t *)
+ * */
+void node_init (
+    node_t *nd, node_index_t type, void *data, uint64_t n_children, ...
+);
+#endif