diff --git a/ci/code_checks.sh b/ci/code_checks.sh
index 570ea1272758a..51745b208c786 100755
--- a/ci/code_checks.sh
+++ b/ci/code_checks.sh
@@ -124,7 +124,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.Index.dropna RT03,SA01" \
         -i "pandas.Index.duplicated RT03" \
         -i "pandas.Index.empty GL08" \
-        -i "pandas.Index.fillna RT03" \
         -i "pandas.Index.get_indexer PR07,SA01" \
         -i "pandas.Index.get_indexer_for PR01,SA01" \
         -i "pandas.Index.get_indexer_non_unique PR07,SA01" \
diff --git a/pandas/core/indexes/base.py b/pandas/core/indexes/base.py
index 2bb0aedb8bd84..ffc228d57a95b 100644
--- a/pandas/core/indexes/base.py
+++ b/pandas/core/indexes/base.py
@@ -2578,6 +2578,7 @@ def fillna(self, value):
         Returns
         -------
         Index
+           NA/NaN values replaced with `value`.
 
         See Also
         --------