diff --git a/src/pseudopeople/configuration/entities.py b/src/pseudopeople/configuration/entities.py
index d7e800c1..c216200c 100644
--- a/src/pseudopeople/configuration/entities.py
+++ b/src/pseudopeople/configuration/entities.py
@@ -6,6 +6,5 @@ class Keys:
     PROBABILITY = "probability"
     CELL_PROBABILITY = "cell_probability"
     TOKEN_PROBABILITY = "token_probability"
-    INCLUDE_ORIGINAL_TOKEN_PROBABILITY = "include_original_token_probability"
     POSSIBLE_AGE_DIFFERENCES = "possible_age_differences"
     ZIPCODE_DIGIT_PROBABILITIES = "digit_probabilities"
diff --git a/src/pseudopeople/configuration/validator.py b/src/pseudopeople/configuration/validator.py
index 8b2e8f02..50b2f9ff 100644
--- a/src/pseudopeople/configuration/validator.py
+++ b/src/pseudopeople/configuration/validator.py
@@ -66,7 +66,7 @@ def _validate_noise_type_config(
         parameter_config_validator = {
             Keys.POSSIBLE_AGE_DIFFERENCES: _validate_possible_age_differences,
             Keys.ZIPCODE_DIGIT_PROBABILITIES: _validate_zipcode_digit_probabilities,
-        }.get(parameter, _validate_standard_parameters)
+        }.get(parameter, _validate_probability)
 
         _ = _get_default_config_node(
             default_noise_type_config, parameter, "parameter", dataset, column, noise_type
@@ -161,10 +161,10 @@ def _validate_zipcode_digit_probabilities(
             f"{len(noise_type_config)} probabilities ({noise_type_config})."
         )
     for value in noise_type_config:
-        _validate_standard_parameters(value, parameter, base_error_message)
+        _validate_probability(value, parameter, base_error_message)
 
 
-def _validate_standard_parameters(
+def _validate_probability(
     noise_type_config: Union[int, float], parameter: str, base_error_message: str
 ) -> None:
     if not isinstance(noise_type_config, (float, int)):
diff --git a/src/pseudopeople/entity_types.py b/src/pseudopeople/entity_types.py
index 51f6b53f..80d6d014 100644
--- a/src/pseudopeople/entity_types.py
+++ b/src/pseudopeople/entity_types.py
@@ -1,5 +1,5 @@
 from dataclasses import dataclass
-from typing import Any, Callable, Dict
+from typing import Any, Callable, Dict, Optional
 
 import pandas as pd
 from loguru import logger
@@ -25,7 +25,7 @@ class RowNoiseType:
     """
 
     name: str
-    noise_function: Callable[[pd.DataFrame, ConfigTree, RandomnessStream], pd.DataFrame]
+    noise_function: Callable[[str, pd.DataFrame, ConfigTree, RandomnessStream], pd.DataFrame]
     probability: float = 0.0
 
     def __call__(
@@ -56,7 +56,7 @@ class ColumnNoiseType:
 
     name: str
     noise_function: Callable[[pd.Series, ConfigTree, RandomnessStream, Any], pd.Series]
-    probability: float = 0.01
+    probability: Optional[float] = 0.01
     noise_level_scaling_function: Callable[[str], float] = lambda x: 1.0
     additional_parameters: Dict[str, Any] = None
 
diff --git a/src/pseudopeople/noise_entities.py b/src/pseudopeople/noise_entities.py
index bf481ecb..6b0dac12 100644
--- a/src/pseudopeople/noise_entities.py
+++ b/src/pseudopeople/noise_entities.py
@@ -92,7 +92,6 @@ class __NoiseTypes(NamedTuple):
         additional_parameters={  # TODO: need to clarify these
             Keys.CELL_PROBABILITY: 0.01,
             Keys.TOKEN_PROBABILITY: 0.1,
-            Keys.INCLUDE_ORIGINAL_TOKEN_PROBABILITY: 0.1,
         },
     )
 
diff --git a/src/pseudopeople/noise_functions.py b/src/pseudopeople/noise_functions.py
index b545235a..5f19334c 100644
--- a/src/pseudopeople/noise_functions.py
+++ b/src/pseudopeople/noise_functions.py
@@ -374,7 +374,8 @@ def keyboard_corrupt(truth, corrupted_pr, addl_pr, rng):
         return err
 
     token_noise_level = configuration[Keys.TOKEN_PROBABILITY]
-    include_token_probability_level = configuration[Keys.INCLUDE_ORIGINAL_TOKEN_PROBABILITY]
+    # TODO: remove this hard-coding
+    include_token_probability_level = 0.1
 
     rng = np.random.default_rng(seed=randomness_stream.seed)
     column = column.astype(str)
diff --git a/tests/unit/test_column_noise.py b/tests/unit/test_column_noise.py
index 7d316baa..5741eba9 100644
--- a/tests/unit/test_column_noise.py
+++ b/tests/unit/test_column_noise.py
@@ -569,7 +569,6 @@ def test_generate_typographical_errors(dummy_dataset, column):
                         NOISE_TYPES.typographic.name: {
                             Keys.CELL_PROBABILITY: 0.1,
                             Keys.TOKEN_PROBABILITY: 0.1,
-                            Keys.INCLUDE_ORIGINAL_TOKEN_PROBABILITY: 0.1,
                         },
                     },
                 },
@@ -598,7 +597,8 @@ def test_generate_typographical_errors(dummy_dataset, column):
 
     # Check for expected string growth due to keeping original noised token
     assert (check_noised.str.len() >= check_original.str.len()).all()
-    p_include_original_token = config[Keys.INCLUDE_ORIGINAL_TOKEN_PROBABILITY]
+    # TODO: remove this hard-coding
+    p_include_original_token = 0.1
     p_token_does_not_increase_string_length = 1 - p_token_noise * p_include_original_token
     p_strings_do_not_increase_length = (
         p_token_does_not_increase_string_length**str_lengths