diff --git a/validation/from_passport.py b/validation/from_passport.py
index 89946cc..ffc18fb 100644
--- a/validation/from_passport.py
+++ b/validation/from_passport.py
@@ -5,22 +5,41 @@ from pydantic import BaseModel, ConfigDict, Field, model_validator
 
 class FromPassport(BaseModel):
     """
-    Fields which can be extracted from description.txt
+    Extracted fields from a scanned passport text.
+    These fields represent key identity and document metadata typically found in machine-readable passports.
     """
     model_config = ConfigDict(validate_assignment=True, str_strip_whitespace=True)
     
     country: str = Field(..., min_length=3, max_length=3)  # ISO 3166-1 alpha-3
     passport_number: str = Field(..., min_length=9, max_length=9, pattern=r"^[A-Z0-9]{9}$")
+    model_config = ConfigDict(validate_assignment=False, str_strip_whitespace=True)
 
-    surname: str = Field(..., min_length=1)
-    given_names: str = Field(..., min_length=1)
+    country: str = Field(
+        ...,
+        min_length=3,
+        max_length=3,
+        description="The country issuing the passport, as a 3-letter ISO 3166-1 alpha-3 code (e.g., 'CHE' for Switzerland)."
+    )
 
-    birth_date: date
-    citizenship: str = Field(..., min_length=2)
-    sex: Literal["M", "F"]
+    passport_number: str = Field(
+        ...,
+        min_length=9,
+        max_length=9,
+        pattern=r"^[A-Z0-9]{9}$",
+        description="The passport number, exactly 9 alphanumeric uppercase characters."
+    )
 
-    issue_date: date
-    expiry_date: date
+    surname: str = Field(
+        ...,
+        min_length=1,
+        description="The surname (family name) of the passport holder."
+    )
+
+    given_names: str = Field(
+        ...,
+        min_length=1,
+        description="The given names (first and middle names) of the passport holder."
+    )
 
     @model_validator(mode='after')
     def check_expiry_date_after_issue_date(self) -> Self:
@@ -28,6 +47,28 @@ class FromPassport(BaseModel):
             raise ValueError(f'Expiry date is not after issue date')
         return self
 
-    signature_present: bool
+    birth_date: date = Field(
+        ...,
+        description="Date of birth of the passport holder in ISO format (YYYY-MM-DD)."
+    )
 
-    machine_readable_zone: str = Field(..., min_length=44)
\ No newline at end of file
+    citizenship: str = Field(
+        ...,
+        min_length=2,
+        description="The nationality or citizenship of the passport holder, preferably as a country name or ISO code."
+    )
+
+    sex: Literal["M", "F"] = Field(
+        ...,
+        description="Sex of the passport holder: 'M' for male, 'F' for female."
+    )
+
+    issue_date: date = Field(
+        ...,
+        description="Date when the passport was issued, in ISO format (YYYY-MM-DD)."
+    )
+
+    expiry_date: date = Field(
+        ...,
+        description="Date when the passport expires, in ISO format (YYYY-MM-DD)."
+    )
\ No newline at end of file