diff --git a/pandas/core/indexing.py b/pandas/core/indexing.py
index 04d1dbceb3342..dd81823055390 100644
--- a/pandas/core/indexing.py
+++ b/pandas/core/indexing.py
@@ -255,6 +255,8 @@ def loc(self) -> "_LocIndexer":
 
         - A boolean array of the same length as the axis being sliced,
           e.g. ``[True, False, True]``.
+        - An alignable boolean Series. The index of the key will be aligned before
+          masking.
         - A ``callable`` function with one argument (the calling Series or
           DataFrame) and that returns valid output for indexing (one of the above)
 
@@ -264,6 +266,8 @@ def loc(self) -> "_LocIndexer":
         ------
         KeyError
             If any items are not found.
+        IndexingError
+            If an indexed key is passed and its index is unalignable to the frame index.
 
         See Also
         --------
@@ -319,6 +323,13 @@ def loc(self) -> "_LocIndexer":
                     max_speed  shield
         sidewinder          7       8
 
+        Alignable boolean Series:
+
+        >>> df.loc[pd.Series([False, True, False],
+        ...        index=['viper', 'sidewinder', 'cobra'])]
+                    max_speed  shield
+        sidewinder          7       8
+
         Conditional that returns a boolean Series
 
         >>> df.loc[df['shield'] > 6]