Add explanation to enums usage as a pydantic field

README.md

@@ -89,7 +89,7 @@ class UserBase(BaseModel):
     username: constr(regex="^[A-Za-z0-9-_]+$", to_lower=True, strip_whitespace=True)
     email: EmailStr
     age: int = Field(ge=18, default=None)  # must be greater or equal to 18
-    favorite_band: MusicBand = None
+    favorite_band: MusicBand = None. # only "AEROSMITH", "QUEEN", "AC/DC" values are allowed to be inputted
     website: AnyUrl = None
 
 ```