Readme update

Author: lan17

README.md

@@ -170,17 +170,49 @@ async def get_user_profile(user_id: str) -> dict:
 
 ### Working with Complex Arguments
 
-Real functions have complex arguments. Use `id_arg` tuples and `arg_adapters` to handle them:
+Options for mapping function arguments to cache keys.
+
+#### `id_arg`
+
+Specifies which argument contains the entity ID for the cache key.
+
+**String form** — use when the argument itself is the ID:
+```python
+id_arg="user_id"  # user_id argument is the ID
+```
+
+**Tuple form** — use when the ID needs to be extracted from an object:
+```python
+id_arg=("user", lambda u: u.id)  # Extract ID from User object
+```
+
+#### `arg_adapters`
+
+Converts complex arguments to strings for the cache key. Only needed for non-primitive types.
+
+```python
+arg_adapters={
+    "filters": lambda f: f.to_cache_key(),  # Complex object
+    "page": str,                             # Simple conversion
+}
+```
+
+#### `ignore_args`
+
+Excludes arguments that don't affect the cached result.
+
+```python
+ignore_args=["db_session", "logger"]
+```
+
+#### Example
 
 ```python
 @gcache.cached(
     key_type="user_id",
-    id_arg=("user", lambda u: u.id),  # Extract ID from User object
-    arg_adapters={
-        "filters": lambda f: f.to_cache_key(),  # Convert complex objects
-        "page": str,  # Simple conversion
-    },
-    ignore_args=["db_session", "logger"],  # Don't include these in cache key
+    id_arg=("user", lambda u: u.id),
+    arg_adapters={"filters": lambda f: f.to_cache_key()},
+    ignore_args=["db_session", "logger"],
 )
 async def search_user_posts(
     user: User,