diff --git a/pandas/core/window/ewm.py b/pandas/core/window/ewm.py
index 4a6ed109a88a3..e35ff5afca66e 100644
--- a/pandas/core/window/ewm.py
+++ b/pandas/core/window/ewm.py
@@ -447,7 +447,7 @@ def var_func(values, begin, end, min_periods):
         create_section_header("Parameters"),
         dedent(
             """
-        other : Series, DataFrame, or ndarray, optional
+        other : Series or DataFrame , optional
             If not supplied then will default to self and produce pairwise
             output.
         pairwise : bool, default None
@@ -514,7 +514,7 @@ def cov_func(x, y):
         create_section_header("Parameters"),
         dedent(
             """
-        other : Series, DataFrame, or ndarray, optional
+        other : Series or DataFrame, optional
             If not supplied then will default to self and produce pairwise
             output.
         pairwise : bool, default None
diff --git a/pandas/core/window/expanding.py b/pandas/core/window/expanding.py
index 77f8486522626..ac1ebfd4b0825 100644
--- a/pandas/core/window/expanding.py
+++ b/pandas/core/window/expanding.py
@@ -560,7 +560,7 @@ def quantile(
         create_section_header("Parameters"),
         dedent(
             """
-        other : Series, DataFrame, or ndarray, optional
+        other : Series or DataFrame, optional
             If not supplied then will default to self and produce pairwise
             output.
         pairwise : bool, default None
@@ -598,7 +598,7 @@ def cov(
         create_section_header("Parameters"),
         dedent(
             """
-        other : Series, DataFrame, or ndarray, optional
+        other : Series or DataFrame, optional
             If not supplied then will default to self and produce pairwise
             output.
         pairwise : bool, default None
diff --git a/pandas/core/window/rolling.py b/pandas/core/window/rolling.py
index 84c05a0563f04..6db86b940737e 100644
--- a/pandas/core/window/rolling.py
+++ b/pandas/core/window/rolling.py
@@ -2111,7 +2111,7 @@ def quantile(self, quantile: float, interpolation: str = "linear", **kwargs):
         create_section_header("Parameters"),
         dedent(
             """
-        other : Series, DataFrame, or ndarray, optional
+        other : Series or DataFrame, optional
             If not supplied then will default to self and produce pairwise
             output.
         pairwise : bool, default None
@@ -2149,7 +2149,7 @@ def cov(
         create_section_header("Parameters"),
         dedent(
             """
-        other : Series, DataFrame, or ndarray, optional
+        other : Series or DataFrame, optional
             If not supplied then will default to self and produce pairwise
             output.
         pairwise : bool, default None