diff --git a/src/include/ast.h b/src/include/ast.h
index ba5ea16..28a1ad5 100644
--- a/src/include/ast.h
+++ b/src/include/ast.h
@@ -1,8 +1,23 @@
 #ifndef AST_H
 #define AST_H
 
-typedef struct {
+typedef enum {
+    AST_TYPE_NUM,
+    AST_TYPE,CALL
+} ASTType;
 
+typedef struct {
+    ASTType type;
+    void* data;
 } AST;
 
+typedef struct {
+    int val;
+} ASTTypeNum;
+
+typedef struct {
+    char* to;
+    char** args;
+} ASTTypeCall;
+
 #endif