diff --git a/vimiv/gui/metadatawidget.py b/vimiv/gui/metadatawidget.py
index cd58cf01f..2ec0ae7d7 100644
--- a/vimiv/gui/metadatawidget.py
+++ b/vimiv/gui/metadatawidget.py
@@ -33,7 +33,7 @@ class MetadataWidget(QLabel):
             _mainwindow_width: width of the mainwindow.
             _path: Absolute path of the current image to load metadata of.
             _current_set: Holds a string of the currently selected keyset.
-            _handler: MetadataHandler for _path or None. Use the handler property to access.
+            _handler: MetadataHandler for _path or None. Accessed via handler property.
         """
 
         STYLESHEET = """
diff --git a/vimiv/imutils/metadata.py b/vimiv/imutils/metadata.py
index 70451c5bb..7f603160b 100644
--- a/vimiv/imutils/metadata.py
+++ b/vimiv/imutils/metadata.py
@@ -25,6 +25,13 @@
 
 
 class _InternalKeyHandler(dict):
+    """Handler to load all internal keys of a single image.
+
+    Attributes:
+        _path: Apsolute path of the image to load the metadata of.
+        _reader: QImageReader or None of _path. Accessed via reder property.
+    """
+
     def __init__(self, path: str):
         super().__init__(
             {
@@ -39,27 +46,38 @@ def __init__(self, path: str):
 
     @property
     def reader(self) -> QImageReader:
+        """Return QImageReader instance of _path."""
         if self._reader is None:
             self._reader = QImageReader(self._path)
         return self._reader
 
     def _get_filesize(self):
+        """Get the file size."""
         return files.get_size_file(self._path)
 
     def _get_filetype(self):
+        """Get the file type."""
         return files.imghdr.what(self._path)
 
     def _get_xdimension(self):
+        """Get the x dimension in pixels."""
         return self.reader.size().width()
 
     def _get_ydimension(self):
+        """Get the y dimension in pixels."""
         return self.reader.size().height()
 
     def __getitem__(self, key: str) -> Tuple[str, str, str]:
+        """Intrypoint to extract the key of the image at _path.
+
+        Args:
+            key: internal key to fetch.
+        """
         key, func = super().get(key.lower())
         return (key, key, func())
 
     def get_keys(self) -> Iterable[str]:
+        """Returns a sequence of all available metadata keys."""
         return (key for key, _ in super().values())
 
 
@@ -94,6 +112,11 @@ def get_date_time(self) -> str:
         self.raise_exception("Retrieving exif date-time")
 
     def fetch_key(self, _base_key: str) -> Tuple[str, str, str]:
+        """Fetch a single metadata key.
+
+        Args:
+            _base_key: metadata key to fetch.
+        """
         self.raise_exception("Getting formatted keys")
 
     def get_keys(self) -> Iterable[str]:
@@ -269,6 +292,7 @@ def fetch_key(self, base_key: str) -> Tuple[str, str, str]:
         return None
 
     def get_keys(self) -> Iterable[str]:
+        """Return a iteable of all available metadata keys."""
         return (key for key in self._metadata if not is_hex(key.rpartition(".")[2]))
 
     def copy_metadata(self, dest: str, reset_orientation: bool = True) -> None:
@@ -330,7 +354,13 @@ def _external_handler(self) -> ExternalKeyHandler:
         return self._ext_handler
 
     def fetch_keys(self, desired_keys: Sequence[str]) -> Dict[Any, Tuple[str, str]]:
-        """Throws: UnsupportedMetadataOperation"""
+        """Extracts a list of metadata keys.
+
+        Throws: UnsupportedMetadataOperation.
+
+        Args:
+            desired_keys: list of metadata keys to extract.
+        """
         metadata = dict()
 
         for base_key in desired_keys:
@@ -344,6 +374,18 @@ def fetch_keys(self, desired_keys: Sequence[str]) -> Dict[Any, Tuple[str, str]]:
 
         return metadata
 
+    def fetch_key(self, key: str) -> Tuple[str, str, str]:
+        """Extracts a single metadata key.
+
+        Throws: UnsupportedMetadataOperation.
+
+        Args:
+            key: single metadata key to extract.
+        """
+        if key.lower().startswith("vimiv"):
+            return self._internal_handler[key]
+        return self._external_handler.fetch_key(key)
+
     def get_keys(self) -> Iterable[str]:
         """Retrieve the name of all metadata keys available.
 
@@ -353,12 +395,6 @@ def get_keys(self) -> Iterable[str]:
             self._internal_handler.get_keys(), self._external_handler.get_keys()
         )
 
-    def fetch_key(self, key: str) -> Tuple[str, str, str]:
-        """Throws: UnsupportedMetadataOperation"""
-        if key.lower().startswith("vimiv"):
-            return self._internal_handler[key]
-        return self._external_handler.fetch_key(key)
-
 
 class ExifOrientation:
     """Namespace for exif orientation tags.