Enum's explanation

README.md

@@ -166,5 +166,6 @@ I will be very grateful for helping me get the things right.
 - [Steam Market id's storage repo](https://github.com/somespecialone/steam-item-name-ids)
 - [steamapi.xpaw.me](https://steamapi.xpaw.me/)
 - [Steam Exchange Rate Tracker](https://github.com/somespecialone/sert)
+- [ethanfurman/aenum](https://github.com/ethanfurman/aenum)
 
 <!--footer-end-->

docs/design.md

@@ -8,7 +8,7 @@ Designed to be flexible with modest complexity, while being typed and developer
 As you can read in [previous](./get_started.md#first-words) chapter, there is two **clients**: public and non-public.
 Both represents interaction layer with `SteamCommunity`.
 Each **client** instance has separate `session`, therefore as **cookies**, and other properties
-(country, currency, ...). 
+(country, currency, ...).
 
 !!! tip
     Think of them as a private-mode window of a web browser. Each **client** instance is a new private mode window,
@@ -46,20 +46,30 @@ This classes inherit all corresponding mixins. [Inheritance](./client.md#inherit
 There is two general types of exceptions: `python` (builtin exceptions, related to invalid arguments values,
 broken connection, so on) and `steam`, that raised when code faced error while trying to interact with `Steam`,
 as follows: `Steam` cannot return market listings, items not in inventory, malformed response, `Steam`
-return error result (`EResult`) deliberately for some reason (lol) or even give your **client** (mainly, by ip) a
-rate limit restriction ([more information](./scraping.md)).
+return error result (`EResult`) deliberately for some reason (😂) or even give your **client** (mainly, by ip) a
+[rate limit restriction](./scraping.md).
 
 ### Modules & entrypoints
 
 `Aiosteampy` contains `utils` and `helpers` moduls, each contain useful utilities to make work with **client** easier.
-[There is](./utils_helpers.md)
+[Is there](./utils_helpers.md)
 
 Alongside with mentioned moduls project have a few `extensions`:
 
 - [user agents](./ext/user_agents.md) - service, which main aim is to help get random user agent for your **client/s**
 - [currency converter](./ext/converter.md) - service, aims to help you convert `Steam` currencies
 
+### Enums
+
+At last, within the project exists two special enums `App` and `AppContext` with unusual behaviour (for `python`).
+In short, _they extend itself when member is missing_, previous means that hardcoded members are just _predefined_.
+
+!!! warning ""
+    Generally, `aiosteampy` support all apps and contexts!
+
+More on [dedicated page](./enums.md), worth reading.
+
 ## Epilogue
 
 _That's it_. Further information introduce short overview of methods, how things work more detailed and even
-hard to say some patterns. Good luck 👋!
+hard to say some patterns. Good luck 👋

docs/enums.md

@@ -0,0 +1,51 @@
+Let's talk about `App` and `AppContext` enum's a little. 
+
+Thankfully to an [aenum](https://github.com/ethanfurman/aenum) package, these enum's extending selves when member is
+missing. Therefore, as mentioned before, hardcoded members are just _predefined_.
+
+!!! note ""
+    You can create `App` and `AppContext` for non-predefined app+context
+
+As instance:
+
+```python
+from aiosteampy import App, AppContext
+
+BANANA_APP = App(2923300)
+BANANA = AppContext((BANANA_APP, 2))  # with context 2
+```
+
+And then use it within your app. Moreover, from now `AppContext` and `App` enums have a new member.
+
+### Caveat
+
+If you print/log `BANANA_APP` you receive something like 
+
+```sh
+<AppContext.AppContext_2923300_2: (<App.App_2923300: 2923300>, 2)>
+```
+
+Not so beautiful, yes. Name is auto-generated, due to inability to know name of the app, if we, for example, 
+get a `trade offer` with non-predefined app items.
+
+!!! warning "Next version"
+    Solution comes in next minor version (0.6.4)
+
+As a workaround you can extend enum manually:
+
+```python
+from aenum import extend_enum
+from aiosteampy import App, AppContext
+
+BANANA_APP = extend_enum(App, "BANANA", 2923300)
+BANANA_DEFAULT_CONTEXT = extend_enum(
+    AppContext, 
+    "BANANA_DEFAULT_CONTEXT", 
+    (BANANA_APP, 2),
+)  # with context 2
+```
+
+Then `repr` of a `AppContext` new member will be:
+```sh
+<AppContext.BANANA_DEFAULT_CONTEXT: (<App.BANANA: 2923300>, 2)>
+```

mkdocs.yml

@@ -80,6 +80,7 @@ nav:
   - "Proxies 🌐": proxies.md
   - Session: session.md
   - "Scraping 🕷️": scraping.md
+  - Enums: enums.md
   - Client: client.md
   - "Market 💹": market.md
   - Trade: trade.md