diff --git a/streaming.py b/streaming.py
index 9fb8b2c..b19da1d 100644
--- a/streaming.py
+++ b/streaming.py
@@ -13,7 +13,7 @@ class Proc:
     Find a running process from Python
     """
     @classmethod
-    def _list_windows(cls):
+    def _list_windows(cls) -> list:
         """
         Find all running process with wmi
         :return: list of dictionaries with descriptions of found processes
@@ -38,7 +38,7 @@ class Proc:
         return execlist
 
     @classmethod
-    def _list_linux(cls):
+    def _list_linux(cls) -> list:
         """
         Find all running process with ps
         :return: list of dictionaries with descriptions of found processes
@@ -55,7 +55,7 @@ class Proc:
         return execlist
 
     @classmethod
-    def list(cls):
+    def list(cls) -> list:
         """
         Find all running process
         :return: list of dictionaries with descriptions of found processes
@@ -68,7 +68,7 @@ class Proc:
             return None
 
     @classmethod
-    def search(cls, find: str, exclude: str = None):
+    def search(cls, find: str, exclude: str = None) -> list:
         """
         Find specified processes
         :param find: find process pid, name or arguments
@@ -93,7 +93,7 @@ class Proc:
                 return proc_found
 
     @classmethod
-    def kill(cls, pid: int):
+    def kill(cls, pid: int) -> None:
         """
         Kill the process by means of the OS
         :param pid: process ID
@@ -111,7 +111,7 @@ class FFmpeg:
     """
     @classmethod
     def run(cls, src: str, preset: str = None, fps: int = None, dst: str = None,
-            ffpath: str = None, watchdog: bool = False, sec: int = 5, mono: bool = False):
+            ffpath: str = None, watchdog: bool = False, sec: int = 5, mono: bool = False) -> None:
         """
         Running the installed ffmpeg
         :param src: sources urls (example: "rtsp://user:pass@host:554/Streaming/Channels/101, anull")
@@ -141,7 +141,7 @@ class FFmpeg:
         exit()
 
     @classmethod
-    def _bin(cls, path_ffmpeg: str):
+    def _bin(cls, path_ffmpeg: str) -> str:
         """
         Returns the path to the ffmpeg depending on the OS
         :param path_ffmpeg: alternative path to bin
@@ -173,7 +173,7 @@ class FFmpeg:
             return None
 
     @classmethod
-    def _src(cls, sources: str):
+    def _src(cls, sources: str) -> list:
         """
         Parsing sources into ffmpeg format
         :param sources: comma-separated list of sources in string format
@@ -192,7 +192,7 @@ class FFmpeg:
         return ' '.join(list_sources)
 
     @classmethod
-    def _preset(cls, choice: str, fps: int):
+    def _preset(cls, choice: str, fps: int) -> str:
         """
         Parsing preset into ffmpeg format
         :param choice: preset selection
@@ -227,7 +227,7 @@ class FFmpeg:
         return ' '.join([tune, video, audio])
 
     @classmethod
-    def _dst(cls, destination: str):
+    def _dst(cls, destination: str) -> str:
         """
         Parsing destination into ffmpeg format
         :param destination:
@@ -245,7 +245,7 @@ class FFmpeg:
         return ' '.join([container, destination, stdout])
 
     @classmethod
-    def _watchdog(cls, pid: int, sec: int = 5, que: Queue = None):
+    def _watchdog(cls, pid: int, sec: int = 5, que: Queue = None) -> None:
         """
         If no data arrives in the queue, kill the process
         :param pid: process ID