diff --git a/doc/source/whatsnew/v3.0.0.rst b/doc/source/whatsnew/v3.0.0.rst
new file mode 100644
index 0000000..1a43d89
--- /dev/null
+++ b/doc/source/whatsnew/v3.0.0.rst
@@ -0,0 +1,7 @@
+What is new in 3.0.0
+====================
+
+Bug fixes
+~~~~~~~~~
+
+- Fixed a bug in groupby.apply that dropped the group key
diff --git a/pandas/core/frame.py b/pandas/core/frame.py
new file mode 100644
index 0000000..163ef97
--- /dev/null
+++ b/pandas/core/frame.py
@@ -0,0 +1,3 @@
+def head(self, n=5):
+    """Return the first n rows."""
+    return self.iloc[:n]