diff --git a/pandas/core/frame.py b/pandas/core/frame.py
index 7f970a72cb12c..129dbe52c5885 100644
--- a/pandas/core/frame.py
+++ b/pandas/core/frame.py
@@ -9803,9 +9803,9 @@ def _get_data() -> DataFrame:
 
     def nunique(self, axis: Axis = 0, dropna: bool = True) -> Series:
         """
-        Count distinct observations over requested axis.
+        Count number of distinct elements in specified axis.
 
-        Return Series with number of distinct observations. Can ignore NaN
+        Return Series with number of distinct elements. Can ignore NaN
         values.
 
         Parameters
@@ -9827,10 +9827,10 @@ def nunique(self, axis: Axis = 0, dropna: bool = True) -> Series:
 
         Examples
         --------
-        >>> df = pd.DataFrame({'A': [1, 2, 3], 'B': [1, 1, 1]})
+        >>> df = pd.DataFrame({'A': [4, 5, 6], 'B': [4, 1, 1]})
         >>> df.nunique()
         A    3
-        B    1
+        B    2
         dtype: int64
 
         >>> df.nunique(axis=1)