diff --git a/python/damask/_grid.py b/python/damask/_grid.py
index 0b3a067e2..b08f99757 100644
--- a/python/damask/_grid.py
+++ b/python/damask/_grid.py
@@ -786,9 +786,8 @@ class Grid:
 
         Parameters
         ----------
-        directions : (sequence of) str
+        directions : (sequence of) {'x', 'y', 'z'}
             Direction(s) along which the grid is mirrored.
-            Valid entries are 'x', 'y', 'z'.
         reflect : bool, optional
             Reflect (include) outermost layers. Defaults to False.
 
@@ -832,16 +831,14 @@ class Grid:
 
 
     def flip(self,
-             directions: Union[Literal['x', 'y', 'z'],
-             Sequence[Literal['x', 'y', 'z']]]) -> 'Grid':
+             directions: Sequence[str]) -> 'Grid':
         """
         Flip grid along given directions.
 
         Parameters
         ----------
-        directions : (sequence of) str
+        directions : (sequence of) {'x', 'y', 'z'}
             Direction(s) along which the grid is flipped.
-            Valid entries are 'x', 'y', 'z'.
 
         Returns
         -------
@@ -1176,9 +1173,9 @@ class Grid:
         ----------
         periodic : bool, optional
             Assume grid to be periodic. Defaults to True.
-        directions : (sequence of) string, optional
+        directions : (sequence of) {'x', 'y', 'z'}, optional
             Direction(s) along which the boundaries are determined.
-            Valid entries are 'x', 'y', 'z'. Defaults to 'xyz'.
+            Defaults to 'xyz'.
 
         Returns
         -------
diff --git a/python/damask/util.py b/python/damask/util.py
index 0cf6606fb..0bbc1e7b5 100644
--- a/python/damask/util.py
+++ b/python/damask/util.py
@@ -305,16 +305,20 @@ def project_equal_angle(vector: np.ndarray,
     normalize : bool
         Ensure unit length of input vector. Defaults to True.
     keepdims : bool
-        Maintain three-dimensional output coordinates. Defaults to False.
-        Two-dimensional output uses right-handed frame spanned by
-        the next and next-next axis relative to the projection direction,
-        e.g. x-y when projecting along z and z-x when projecting along y.
+        Maintain three-dimensional output coordinates.
+        Defaults to False.
 
     Returns
     -------
     coordinates : numpy.ndarray, shape (...,2 | 3)
         Projected coordinates.
 
+    Notes
+    -----
+    Two-dimensional output uses right-handed frame spanned by
+    the next and next-next axis relative to the projection direction,
+    e.g. x-y when projecting along z and z-x when projecting along y.
+
     Examples
     --------
     >>> import damask
@@ -349,16 +353,21 @@ def project_equal_area(vector: np.ndarray,
     normalize : bool
         Ensure unit length of input vector. Defaults to True.
     keepdims : bool
-        Maintain three-dimensional output coordinates. Defaults to False.
-        Two-dimensional output uses right-handed frame spanned by
-        the next and next-next axis relative to the projection direction,
-        e.g. x-y when projecting along z and z-x when projecting along y.
+        Maintain three-dimensional output coordinates.
+        Defaults to False.
 
     Returns
     -------
     coordinates : numpy.ndarray, shape (...,2 | 3)
         Projected coordinates.
 
+    Notes
+    -----
+    Two-dimensional output uses right-handed frame spanned by
+    the next and next-next axis relative to the projection direction,
+    e.g. x-y when projecting along z and z-x when projecting along y.
+
+
     Examples
     --------
     >>> import damask