diff --git a/ci/code_checks.sh b/ci/code_checks.sh
index 1e9250fd77fe5..7452d390db574 100755
--- a/ci/code_checks.sh
+++ b/ci/code_checks.sh
@@ -307,7 +307,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.api.types.is_string_dtype SA01" \
         -i "pandas.api.types.is_timedelta64_ns_dtype SA01" \
         -i "pandas.api.types.pandas_dtype PR07,RT03,SA01" \
-        -i "pandas.api.types.union_categoricals RT03,SA01" \
         -i "pandas.arrays.ArrowExtensionArray PR07,SA01" \
         -i "pandas.arrays.BooleanArray SA01" \
         -i "pandas.arrays.DatetimeArray SA01" \
diff --git a/pandas/core/dtypes/concat.py b/pandas/core/dtypes/concat.py
index 17e68b0e19a68..dcf8cb5c78536 100644
--- a/pandas/core/dtypes/concat.py
+++ b/pandas/core/dtypes/concat.py
@@ -190,6 +190,7 @@ def union_categoricals(
     Returns
     -------
     Categorical
+        The union of categories being combined.
 
     Raises
     ------
@@ -201,6 +202,11 @@ def union_categoricals(
     ValueError
         Empty list of categoricals passed
 
+    See Also
+    --------
+    CategoricalDtype : Type for categorical data with the categories and orderedness.
+    Categorical : Represent a categorical variable in classic R / S-plus fashion.
+
     Notes
     -----
     To learn more about categories, see `link