diff --git a/spec/API_specification/dataframe_api/dataframe_object.py b/spec/API_specification/dataframe_api/dataframe_object.py
index c133d79a..5597c849 100644
--- a/spec/API_specification/dataframe_api/dataframe_object.py
+++ b/spec/API_specification/dataframe_api/dataframe_object.py
@@ -19,6 +19,11 @@ def dataframe(self) -> object:
         If a library only implements the Standard, then this can return `self`.
         """
         ...
+    
+    def shape(self) -> tuple[int, int]:
+        """
+        Return number of rows and number of columns.
+        """
 
     def groupby(self, keys: Sequence[str], /) -> GroupBy:
         """