diff --git a/pleskdistup/common/src/util.py b/pleskdistup/common/src/util.py
index 26144c1..f905813 100644
--- a/pleskdistup/common/src/util.py
+++ b/pleskdistup/common/src/util.py
@@ -33,6 +33,10 @@ def exec_get_output_streamed(
     process_stderr_line: typing.Optional[typing.Callable[[str], None]],
     **kwargs,
 ) -> int:
+    '''
+    Allows to get stdout/stderr by streaming line by line, by calling callbacks
+    and returns process exit code
+    '''
     kwargs["stdout"] = (subprocess.DEVNULL if process_stdout_line is None
                         else subprocess.PIPE)
     kwargs["stderr"] = (subprocess.DEVNULL if process_stderr_line is None