diff --git a/berserk/clients/studies.py b/berserk/clients/studies.py
index 305ecde..d92cec4 100644
--- a/berserk/clients/studies.py
+++ b/berserk/clients/studies.py
@@ -23,6 +23,13 @@ def export_chapter(
     ) -> str:
         """Export one chapter of a study.
 
+        :param study_id: study id
+        :param chapter_id: chapter id
+        :param clocks: include any clock comments in the PGN moves
+        :param comments: include any analysis and annotator comments in the PGN moves
+        :param variations: include any variations in the PGN moves
+        :param source: include a `Source` PGN tag containing the chapter URL
+        :param orientation: include an `Orientation` PGN tag containing the chapter's board orientation
         :return: chapter PGN
         """
         path = f"/api/study/{study_id}/{chapter_id}.pgn"
@@ -46,7 +53,13 @@ def export(
     ) -> Iterator[str]:
         """Export all chapters of a study.
 
-        :return: iterator over all chapters as PGN
+        :param study_id: study id
+        :param clocks: include any clock comments in the PGN moves
+        :param comments: include any analysis and annotator comments in the PGN moves
+        :param variations: include any variations in the PGN moves
+        :param source: for each chapter, include a `Source` PGN tag containing the chapter URL
+        :param orientation: for each chapter, include an `Orientation` PGN tag containing the chapter's board orientation
+        :return: iterator over all chapters as PGNs
         """
         path = f"/api/study/{study_id}.pgn"
         params = {
@@ -73,7 +86,14 @@ def export_by_username(
 
         If not, only public (non-unlisted) studies are included.
 
-        return:iterator over all chapters as PGN"""
+        :param username: the user whose studies will be exported
+        :param clocks: include any clock comments in the PGN moves
+        :param comments: include any analysis and annotator comments in the PGN moves
+        :param variations: include any variations in the PGN moves
+        :param source: for each chapter, include a `Source` PGN tag containing the chapter URL
+        :param orientation: for each chapter, include an `Orientation` PGN tag containing the chapter's board orientation
+        :return: iterator over all chapters as PGNs
+        """
         path = f"/study/by/{username}/export.pgn"
         params = {
             "clocks": clocks,
@@ -92,7 +112,7 @@ def import_pgn(
         orientation: Color = "white",
         variant: Variant = "standard",
     ) -> List[ChapterIdName]:
-        """Imports arbitrary PGN into an existing study.
+        """Imports an arbitrary PGN into an existing study.
         Creates a new chapter in the study.
 
         If the PGN contains multiple games (separated by 2 or more newlines) then multiple chapters will be created within the study.