diff --git a/docs/proposals/parameter-distribution.md b/docs/proposals/parameter-distribution.md
index 2715e29a4b4..5d263564367 100644
--- a/docs/proposals/parameter-distribution.md
+++ b/docs/proposals/parameter-distribution.md
@@ -54,7 +54,6 @@ def _get_search_space(param_name, param):
 The `_get_search_space` function constructs a search space that represents the entire parameter space defined by Nevergrad. 
 
 ## API Design
-- [Distribution](#api-v1-beta1-Distribution)
 - [ExperimentSpec](#api-v1-beta1-ExperimentSpec)
 
 <a name="api-v1-beta1-ExperimentSpec"></a>
@@ -68,7 +67,6 @@ It is assumed that objective function f(x) does not change in the course of an E
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | parameter_specs | [ExperimentSpec.ParameterSpecs](#api-v1-beta1-ExperimentSpec-ParameterSpecs) |  |  |
-| distribution | [ExperimentSpec.Distribution](#api-v1-beta1-ExperimentSpec-Distribution) |  |  |
 | objective | [ObjectiveSpec](#api-v1-beta1-ObjectiveSpec) |  | Objective specification for the Experiment. |
 | algorithm | [AlgorithmSpec](#api-v1-beta1-AlgorithmSpec) |  | HP or NAS algorithm specification for the Experiment. |
 | early_stopping | [EarlyStoppingSpec](#api-v1-beta1-EarlyStoppingSpec) |  | Early stopping specification for the Experiment. |
@@ -76,28 +74,20 @@ It is assumed that objective function f(x) does not change in the course of an E
 | max_trial_count | [int32](#int32) |  | Max completed Trials to mark Experiment as succeeded. |
 | nas_config | [NasConfig](#api-v1-beta1-NasConfig) |  | NAS configuration for the Experiment. |
 
-<a name="api-v1-beta1-ExperimentSpec-Distribution"></a>
 
-### ExperimentSpec.Distribution
-List of Distribution.
+<a name="api-v1-beta1-ParameterSpec"></a>
 
-
-| Field | Type | Label | Description |
-| ----- | ---- | ----- | ----------- |
-| distributions | [Distribution](#api-v1-beta1-Distribution) | repeated |  |
-
-<a name="api-v1-beta1-Distribution"></a>
-
-### Distribution
+### ParameterSpec
 Config for a hyperparameter.
 Katib will create each Hyper parameter from this config.
 
 
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
-| name | [string](#string) |  | Name of the Distribution. |
+| name | [string](#string) |  | Name of the parameter. |
+| parameter_type | [ParameterType](#api-v1-beta1-ParameterType) |  | Type of the parameter. |
 | distribution_type | [DistributionType](#api-v1-beta1-DistributionType) |  | Type of the Distribution. |
-| feasible_space | [FeasibleSpace](#api-v1-beta1-FeasibleSpace) |  | FeasibleSpace for the Distribution. |
+| feasible_space | [FeasibleSpace](#api-v1-beta1-FeasibleSpace) |  | FeasibleSpace for the parameter. |
 
 <a name="api-v1-beta1-DistributionType"></a>