diff --git a/src/symtab.h b/src/symtab.h
index b106908..a3a47d7 100644
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -28,7 +28,6 @@ typedef struct LineListRec {
  */
 typedef struct BucketListRec {
     char *name;
-    TreeNode *treeNode;
     LineList lines;
     ExpType type;
     int memloc; /* memory location for variable */
@@ -74,46 +73,35 @@ void insert_scope_to_list(Scope scope);
  * @return the current scope or NULL if the stack is empty
  */
 Scope curr_scope(void);
-
 /**
  * insert a variable into the symbol table
  * or update a variable if it already exists
  * @param scope_name name of the scope
  * @param name name of the variable
  * @param type type of the variable
- * @param treeNode syntax tree node
  * @param lineno line number of the variable
  * @param loc memory location of the variable
  * @return 0 if success, -1 if failure
  */
-int st_try_insert(
-        char *scope_name,
-        char *name,
-        ExpType type,
-        TreeNode *treeNode,
-        int loc);
-
+int st_try_insert(char *name, ExpType type, int loc);
 /**
  * lookup a variable in the current scope
  * @param name name of the variable to lookup
  * @return the bucket list entry of the variable or NULL if not found
  */
 BucketList st_lookup_current(char *name);
-
 /**
- * lookup a variable from the given scope
+ * lookup a variable from the given scope to root
  * @param name name of the variable to lookup
  * @return the bucket list entry of the variable or NULL if not found
  */
 BucketList st_lookup(char *name);
-
 /**
  * find a scope from the scope list
  * @param scope_name name of the scope to find
  * @return the scope or NULL if not found
  */
 Scope find_scope(char *scope_name);
-
 /** 
  * Procedure printSymTab prints a formatted 
  * listing of the symbol table contents