diff --git a/search/method.py b/search/method.py
index 9180ec1a126561c18b2bb6d6d13a477d59ec55b2..517c09aeabed8caae681ee783008efbc7163851d 100644
--- a/search/method.py
+++ b/search/method.py
@@ -7,6 +7,19 @@ Read from JSON file:
     -> load each piece into board's dictionary.
     -> ensure format token to distinguish between upper and lower.
     -> handling file IO exception
+    
+    format will be :
+    position_dict = {
+        "s1" = (row, column),
+        ...
+    }
+        -> for the key: 'c#'
+            c -character indicate which type it is {rock -> 'r'
+                                                ,paper -> 'p'
+                                                ,scissor -> 's'
+                                                ,block -> ''}
+            # - number to identify the specific token in the set of token with same type.
+                start from 1.
 """
 def to_position_list(file):
     TYPE = 0