diff --git a/src/coordinator.py b/src/coordinator.py
index 24373f3..cb011f1 100644
--- a/src/coordinator.py
+++ b/src/coordinator.py
@@ -22,7 +22,7 @@ RUNNER_DICT: dict[str, type[Runner]] = {
 
 
 class Coordinator:
-    def __init__(self, env_paths_list: list[Path], output_dir: Path, session_id: str):
+    def __init__(self, env_paths_list: list[Path], output_dir: Path, session_id: str) -> None:
         out_string = "".join([e.name + "\n" for e in env_paths_list])
         out_string += f"output_dir = {output_dir}\n"
         out_string += f"session_id = {session_id}"
@@ -55,19 +55,19 @@ class Coordinator:
                 print("dependency", dependency.name)
         exit()
 
-    def setup_test(self):
+    def setup_test(self) -> None:
         logger.info("calling setup_test()")
         self.DIR.create_all_dirs()
         self._copy_env_files()
 
-    def _copy_env_files(self):
+    def _copy_env_files(self) -> None:
         """Copies all env files to STATES/env_files. Files will be renamed to their own TYPE value."""
         env_files_dir = self.DIR.STATES / "env_files"
         env_files_dir.mkdir(exist_ok=True)
         for env_file in self.env_files:
             shutil.copy(env_file.env_path, env_files_dir / env_file.env_type)
 
-    def run_test(self):
+    def run_test(self) -> None:
         logger.info("calling run_test()")
         self.runners: list[Runner] = self._load_runners(self.env_files)
         for runner in self.runners:
@@ -79,6 +79,7 @@ class Coordinator:
         logger.info("run_test() finished")
 
     def _load_runners(self, env_files: list[EnvFile]) -> list[Runner]:
+        """Creates an instance of the correct Runner class for each given env file"""
         runners = []
         for env_file in env_files:
             RunnerClass = RUNNER_DICT[env_file.config["TYPE"]]
@@ -87,7 +88,8 @@ class Coordinator:
             )
         return runners
 
-    def combine_html(self):
+    def combine_html(self) -> None:
+        """combines all generated pytest html reports into one"""
         in_path = str(self.DIR.RECORDS / "html")
         out_path = str(self.DIR.RECORDS / "full-report.html")
         title = "combined.html"