diff --git a/api/ovdashboard_api/__init__.py b/api/ovdashboard_api/__init__.py
index 5780659..36d78ee 100644
--- a/api/ovdashboard_api/__init__.py
+++ b/api/ovdashboard_api/__init__.py
@@ -1,3 +1,10 @@
+"""
+Package `ovdashboard_api`: Contains the API powering the 
+"OVDashboard" application.
+
+This file: Sets up logging.
+"""
+
 import logging.config
 
 from .config import LogConfig
diff --git a/api/ovdashboard_api/async_helpers.py b/api/ovdashboard_api/async_helpers.py
index ce0ac4f..a1de3dc 100644
--- a/api/ovdashboard_api/async_helpers.py
+++ b/api/ovdashboard_api/async_helpers.py
@@ -1,3 +1,7 @@
+"""
+Some useful helpers for working in async contexts.
+"""
+
 from asyncio import get_running_loop
 from functools import partial, wraps
 from time import time
@@ -7,7 +11,7 @@ from async_lru import alru_cache
 
 def run_in_executor(f):
     """
-    Decorator to make blocking function call asyncio compatible
+    Decorator to make blocking a function call asyncio compatible.
     https://stackoverflow.com/questions/41063331/how-to-use-asyncio-with-existing-blocking-library/
     """
 
@@ -24,13 +28,19 @@ def run_in_executor(f):
 
 def get_ttl_hash(seconds: int = 20) -> int:
     """
-    Return the same value within `seconds` time period
+    Return the same value within `seconds` time period.
     https://stackoverflow.com/a/55900800
     """
+
     return round(time() / seconds)
 
 
 def timed_alru_cache(**decorator_kwargs):
+    """
+    Decorator which adds an (unused) param `ttl_hash`
+    and the `@alru_cache` annotation to a function.
+    """
+
     def decorate(f):
         @alru_cache(**decorator_kwargs)
         @wraps(f)
diff --git a/api/ovdashboard_api/config.py b/api/ovdashboard_api/config.py
index 83e61a4..c124076 100644
--- a/api/ovdashboard_api/config.py
+++ b/api/ovdashboard_api/config.py
@@ -1,3 +1,7 @@
+"""
+Python representation of the "config.txt" file inside the WebDAV directory.
+"""
+
 from io import BytesIO
 from typing import Any
 
@@ -11,8 +15,8 @@ from .dav_file import DavFile
 
 class LogConfig(BaseModel):
     """
+    Logging configuration to be set for the server.
     https://stackoverflow.com/a/67937084
-    Logging configuration to be set for the server
     """
 
     LOG_FORMAT: str = "%(levelprefix)s [%(asctime)s] %(name)s: %(message)s"
@@ -41,6 +45,10 @@ class LogConfig(BaseModel):
 
 
 class ImageConfig(BaseModel):
+    """
+    Sections "[image.*]" in "config.txt".
+    """
+
     mode: str = "RGB"
     save_params: dict[str, Any] = {
         "format": "JPEG",
@@ -49,12 +57,20 @@ class ImageConfig(BaseModel):
 
 
 class Config(BaseModel):
+    """
+    Main representation of "config.txt".
+    """
+
     ticker_separator: str = " +++ "
 
     image: ImageConfig = ImageConfig()
 
     @classmethod
     async def get(cls) -> "Config":
+        """
+        Load the configuration instance from the server using `TOML`.
+        """
+
         dav_file = DavFile("config.txt")
 
         try:
diff --git a/api/ovdashboard_api/dav_calendar.py b/api/ovdashboard_api/dav_calendar.py
index cea94f0..7e10dd5 100644
--- a/api/ovdashboard_api/dav_calendar.py
+++ b/api/ovdashboard_api/dav_calendar.py
@@ -1,3 +1,9 @@
+"""
+Definition of an asyncio compatible CalDAV calendar.
+
+Caches events using `timed_alru_cache`.
+"""
+
 import logging
 from dataclasses import dataclass
 from datetime import datetime, timedelta
@@ -17,11 +23,25 @@ _logger = logging.getLogger(__name__)
 
 
 def _string_strip(in_str: str) -> str:
+    """
+    Wrapper for str.strip().
+
+    Used to define `pydantic` validators.
+    """
     return in_str.strip()
 
 
 @total_ordering
 class CalEvent(BaseModel):
+    """
+    A CalDAV calendar event.
+
+    Properties are to be named as in the EVENT component of
+    RFC5545 (iCalendar).
+
+    https://icalendar.org/iCalendar-RFC-5545/3-6-1-event-component.html
+    """
+
     summary: str = ""
     description: str = ""
     dtstart: datetime = datetime.utcnow()
@@ -31,9 +51,17 @@ class CalEvent(BaseModel):
         frozen = True
 
     def __lt__(self, other: "CalEvent") -> bool:
+        """
+        Order Events by start time.
+        """
+
         return self.dtstart < other.dtstart
 
     def __eq__(self, other: "CalEvent") -> bool:
+        """
+        Compare all properties.
+        """
+
         return self.dict() == other.dict()
 
     _validate_summary = validator(
@@ -48,6 +76,10 @@ class CalEvent(BaseModel):
 
     @classmethod
     def from_vevent(cls, event: VEvent) -> "CalEvent":
+        """
+        Create a CalEvent instance from a `VObject.VEvent` object.
+        """
+
         data = {}
 
         for key in cls().dict().keys():
@@ -64,6 +96,9 @@ class CalEvent(BaseModel):
 async def _get_calendar(
     calendar_name: str,
 ) -> Calendar:
+    """
+    Get a calendar by name using the CalDAV principal object.
+    """
 
     @run_in_executor
     def _inner() -> Calendar:
@@ -76,9 +111,21 @@ async def _get_calendar(
 async def _get_calendar_events(
     calendar_name: str,
 ) -> list[CalEvent]:
+    """
+    Get a sorted list of events by CalDAV calendar name.
+
+    Do not return an iterator here - this result is cached and
+    an iterator would get consumed.
+    """
 
     @run_in_executor
     def _inner() -> Iterator[VEvent]:
+        """
+        Get events by CalDAV calendar name.
+
+        This can return an iterator - only the outer function is
+        cached.
+        """
         _logger.info(f"updating {calendar_name!r} ...")
 
         calendar = caldav_principal().calendar(calendar_name)
@@ -119,10 +166,18 @@ async def _get_calendar_events(
 
 @dataclass(frozen=True)
 class DavCalendar:
+    """
+    Object representation of a CalDAV calendar.
+    """
+
     calendar_name: str
 
     @property
     async def calendar(self) -> Calendar:
+        """
+        Calendar as `caldav` library representation.
+        """
+
         return await _get_calendar(
             ttl_hash=get_ttl_hash(SETTINGS.cache_seconds),
             calendar_name=self.calendar_name,
@@ -130,6 +185,10 @@ class DavCalendar:
 
     @property
     async def events(self) -> list[CalEvent]:
+        """
+        Calendar events in object representation.
+        """
+
         return await _get_calendar_events(
             ttl_hash=get_ttl_hash(SETTINGS.cache_seconds),
             calendar_name=self.calendar_name,
diff --git a/api/ovdashboard_api/dav_common.py b/api/ovdashboard_api/dav_common.py
index f57934c..5654b0b 100644
--- a/api/ovdashboard_api/dav_common.py
+++ b/api/ovdashboard_api/dav_common.py
@@ -1,3 +1,7 @@
+"""
+Definition of WebDAV and CalDAV clients.
+"""
+
 from functools import lru_cache
 from typing import Any
 
@@ -18,11 +22,19 @@ _WEBDAV_CLIENT = WebDAVclient({
 
 @lru_cache
 def webdav_resource(remote_path: Any) -> WebDAVResource:
+    """
+    Gets a resource using the main WebDAV client.
+    """
+
     return _WEBDAV_CLIENT.resource(remote_path)
 
 
 @run_in_executor
-def webdav_list(remote_path: str) -> list:
+def webdav_list(remote_path: str) -> list[str]:
+    """
+    Asynchroneously lists a WebDAV path using the main WebDAV client.
+    """
+
     return _WEBDAV_CLIENT.list(remote_path)
 
 
@@ -34,4 +46,8 @@ _CALDAV_CLIENT = CalDAVclient(
 
 
 def caldav_principal() -> CalDAVPrincipal:
+    """
+    Gets the `Principal` object of the main CalDAV client.
+    """
+
     return _CALDAV_CLIENT.principal()
diff --git a/api/ovdashboard_api/dav_file.py b/api/ovdashboard_api/dav_file.py
index acaa22c..991d9a3 100644
--- a/api/ovdashboard_api/dav_file.py
+++ b/api/ovdashboard_api/dav_file.py
@@ -1,3 +1,9 @@
+"""
+Definition of an asyncio compatible WebDAV file.
+
+Caches files using `timed_alru_cache`.
+"""
+
 import logging
 from dataclasses import dataclass
 from io import BytesIO
@@ -16,6 +22,9 @@ _logger = logging.getLogger(__name__)
 async def _get_buffer(
     remote_path: Any,
 ) -> BytesIO:
+    """
+    Download file contents into a new `BytesIO` object.
+    """
 
     @run_in_executor
     def _inner(resource: Resource) -> BytesIO:
@@ -30,21 +39,37 @@ async def _get_buffer(
 
 @dataclass(frozen=True)
 class DavFile:
+    """
+    Object representation of a WebDAV file.
+    """
+
     remote_path: str
 
+    @property
+    def resource(self) -> Resource:
+        """
+        WebDAV file handle.
+        """
+
+        return webdav_resource(self.remote_path)
+
     @property
     async def __buffer(self) -> BytesIO:
+        """
+        File contents as binary stream.
+        """
+
         return await _get_buffer(
             ttl_hash=get_ttl_hash(SETTINGS.cache_seconds),
             remote_path=self.remote_path,
         )
 
-    @property
-    def resource(self) -> Resource:
-        return webdav_resource(self.remote_path)
-
     @property
     async def bytes(self) -> bytes:
+        """
+        File contents as binary data.
+        """
+
         buffer = await self.__buffer
 
         buffer.seek(0)
@@ -52,10 +77,18 @@ class DavFile:
 
     @property
     async def string(self) -> str:
+        """
+        File contents as string.
+        """
+
         bytes = await self.bytes
         return bytes.decode(encoding="utf-8")
 
     async def dump(self, content: bytes) -> None:
+        """
+        Write bytes into file.
+        """
+
         @run_in_executor
         def _inner() -> None:
             buffer = BytesIO(content)
diff --git a/api/ovdashboard_api/main.py b/api/ovdashboard_api/main.py
index 77e1311..c133181 100644
--- a/api/ovdashboard_api/main.py
+++ b/api/ovdashboard_api/main.py
@@ -1,11 +1,9 @@
 #!/usr/bin/env python3
 
 """
-Main executable of `ovdashboard_api`.
+Main script for `ovdashboard_api` module.
 
 Creates the main `FastAPI` app.
-
-If run directly, uses `uvicorn` to run the app.
 """
 
 import uvicorn
@@ -30,6 +28,10 @@ app.include_router(main_router)
 
 
 def main() -> None:
+    """
+    If the `main` script is run, `uvicorn` is used to run the app.
+    """
+
     uvicorn.run(
         app="ovdashboard_api.main:app",
         host="0.0.0.0",
diff --git a/api/ovdashboard_api/routers/_common.py b/api/ovdashboard_api/routers/_common.py
index 2ea5373..2b5f4ed 100644
--- a/api/ovdashboard_api/routers/_common.py
+++ b/api/ovdashboard_api/routers/_common.py
@@ -1,3 +1,7 @@
+"""
+Dependables for defining Routers.
+"""
+
 import re
 from dataclasses import dataclass
 from typing import Iterator, Protocol
@@ -10,7 +14,11 @@ from ..dav_common import caldav_principal, webdav_list
 
 @dataclass(frozen=True)
 class NameLister(Protocol):
-    def __call__(self) -> Iterator[str]:
+    """
+    Can be called to create an iterator containing some names.
+    """
+
+    async def __call__(self) -> Iterator[str]:
         ...
 
 
@@ -23,6 +31,12 @@ _RESPONSE_OK = {
 
 @dataclass(frozen=True)
 class FileNameLister:
+    """
+    Can be called to create an iterator containing file names.
+
+    File names listed will be in `remote_path` and will match the RegEx `re`.
+    """
+
     remote_path: str
     re: re.Pattern[str]
 
@@ -52,6 +66,10 @@ class FileNameLister:
 
 @dataclass(frozen=True)
 class CalendarNameLister:
+    """
+    Can be called to create an iterator containing calendar names.
+    """
+
     async def __call__(self) -> Iterator[str]:
         return (
             cal.name
@@ -61,6 +79,13 @@ class CalendarNameLister:
 
 @dataclass(frozen=True)
 class PrefixFinder:
+    """
+    Can be called to create an iterator containing some names, all starting
+    with a given prefix.
+
+    All names will be taken from the list produced by the called `lister`.
+    """
+
     lister: NameLister
 
     @property
@@ -84,6 +109,14 @@ class PrefixFinder:
 
 @dataclass(frozen=True)
 class PrefixUnique:
+    """
+    Can be called to determine if a given prefix is unique in the list
+    produced by the called `finder`.
+
+    On success, produces the unique name with that prefix. Otherwise,
+    throws a HTTPException.
+    """
+
     finder: PrefixFinder
 
     @property
diff --git a/api/ovdashboard_api/routers/calendar.py b/api/ovdashboard_api/routers/calendar.py
index d8edd3d..e19c4f1 100644
--- a/api/ovdashboard_api/routers/calendar.py
+++ b/api/ovdashboard_api/routers/calendar.py
@@ -1,3 +1,11 @@
+"""
+Router "calendar" provides:
+
+- listing calendars
+- finding calendars by name prefix
+- getting calendar events by calendar name prefix
+"""
+
 from typing import Iterator
 
 from fastapi import APIRouter, Depends
diff --git a/api/ovdashboard_api/routers/image.py b/api/ovdashboard_api/routers/image.py
index ec8fe62..a2652c0 100644
--- a/api/ovdashboard_api/routers/image.py
+++ b/api/ovdashboard_api/routers/image.py
@@ -1,3 +1,11 @@
+"""
+Router "image" provides:
+
+- listing image files
+- finding image files by name prefix
+- getting image files in a uniform format by name prefix
+"""
+
 import re
 from io import BytesIO
 from typing import Iterator
diff --git a/api/ovdashboard_api/routers/text.py b/api/ovdashboard_api/routers/text.py
index 168eb2a..58c92c3 100644
--- a/api/ovdashboard_api/routers/text.py
+++ b/api/ovdashboard_api/routers/text.py
@@ -1,3 +1,11 @@
+"""
+Router "text" provides:
+
+- listing text files
+- finding text files by name prefix
+- getting image file content as converted Markdown by name prefix
+"""
+
 import re
 from typing import Iterator
 
diff --git a/api/ovdashboard_api/settings.py b/api/ovdashboard_api/settings.py
index 8cd9aaf..aeae1e5 100644
--- a/api/ovdashboard_api/settings.py
+++ b/api/ovdashboard_api/settings.py
@@ -35,11 +35,19 @@ class Settings(BaseSettings):
 
     @property
     def caldav_url(self) -> str:
+        """
+        Combined CalDAV URL.
+        """
+
         return f"{self.dav_protocol}://" + \
             f"{self.dav_host}{self.caldav_base_url}"
 
     @property
     def webdav_url(self) -> str:
+        """
+        Combined WebDAV URL.
+        """
+
         return f"{self.dav_protocol}://" + \
             f"{self.dav_host}{self.webdav_base_url}"