diff --git a/rwx/fs/__init__.py b/rwx/fs/__init__.py
index b1da3a2..82b7c16 100644
--- a/rwx/fs/__init__.py
+++ b/rwx/fs/__init__.py
@@ -62,7 +62,8 @@ def read_file_lines(file_path: str, charset: str = CHARSET):
     return read_file_text(file_path).split(os.linesep)
 
 
-def read_file_text(file_path: str, charset: str = CHARSET):
+def read_file_text(file_path: str, charset: str = CHARSET) -> str:
+    """Read whole file text."""
     return read_file_bytes(file_path).decode(charset)