diff --git a/py-polars/polars/io/ipc/functions.py b/py-polars/polars/io/ipc/functions.py
index ce05d19eaf0c..4443c31d513f 100644
--- a/py-polars/polars/io/ipc/functions.py
+++ b/py-polars/polars/io/ipc/functions.py
@@ -31,6 +31,8 @@
     from polars._typing import SchemaDict
 
 
+@deprecate_renamed_parameter("row_count_name", "row_index_name", version="0.20.4")
+@deprecate_renamed_parameter("row_count_offset", "row_index_offset", version="0.20.4")
 def read_ipc(
     source: str | Path | IO[bytes] | bytes,
     *,
@@ -341,6 +343,8 @@ def read_ipc_schema(source: str | Path | IO[bytes] | bytes) -> dict[str, DataTyp
     return _read_ipc_schema(source)
 
 
+@deprecate_renamed_parameter("row_count_name", "row_index_name", version="0.20.4")
+@deprecate_renamed_parameter("row_count_offset", "row_index_offset", version="0.20.4")
 def scan_ipc(
     source: str | Path | list[str] | list[Path],
     *,
diff --git a/py-polars/polars/io/ndjson.py b/py-polars/polars/io/ndjson.py
index 739daa7d0c36..e8eccca53ccd 100644
--- a/py-polars/polars/io/ndjson.py
+++ b/py-polars/polars/io/ndjson.py
@@ -5,6 +5,7 @@
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Sequence
 
+from polars._utils.deprecation import deprecate_renamed_parameter
 from polars._utils.various import normalize_filepath
 from polars._utils.wrap import wrap_df, wrap_ldf
 from polars.datatypes import N_INFER_DEFAULT
@@ -162,6 +163,8 @@ def read_ndjson(
     ).collect()
 
 
+@deprecate_renamed_parameter("row_count_name", "row_index_name", version="0.20.4")
+@deprecate_renamed_parameter("row_count_offset", "row_index_offset", version="0.20.4")
 def scan_ndjson(
     source: str | Path | list[str] | list[Path],
     *,