diff --git a/changelog.md b/changelog.md
index e1534b5b..5da74050 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,6 +1,11 @@
 # Changelog
 
 ## Unreleased
+### Added
+- sort_values_first_koalas function fo perform correctly sort_values(...).first() wehn using koalas dataframe
+
+### Fixed
+- merge_visit sort_values(...).first() issue is corrected
 
 ## v0.1.7 (2024-04-12)
 ### Changed
diff --git a/eds_scikit/utils/sort_first_koalas.py b/eds_scikit/utils/sort_first_koalas.py
index f4f93628..970957cd 100644
--- a/eds_scikit/utils/sort_first_koalas.py
+++ b/eds_scikit/utils/sort_first_koalas.py
@@ -1,4 +1,23 @@
-def sort_values_first_koalas(dataframe, by_cols, cols, ascending=True):
+from eds_scikit.utils.typing import DataFrame
+from typing import List
+
+def sort_values_first_koalas(dataframe : DataFrame , by_cols : List[str], cols : List[str], ascending : bool = True) -> DataFrame:
+    """Replacement for dataframe.sort_values(cols).groupby(by_cols).first()
+
+    To get a deterministic first, provide an id column of your dataframe as the last element of cols.
+
+    Parameters
+    ----------
+    dataframe : DataFrame
+    by_cols : List[str]
+    cols : List[str]
+    ascending : bool, optional
+
+    Returns
+    -------
+    DataFrame
+
+        """
     for col in cols:
         dataframe_min_max = dataframe.groupby(by_cols, as_index=False)[col]
         dataframe_min_max = (