diff --git a/README.md b/README.md
index 6eacc7c4..afcc8622 100644
--- a/README.md
+++ b/README.md
@@ -98,6 +98,7 @@ OPTIONS:
         --optional-nullable-parameters                           Generate nullable parameters as optional parameters
         --trim-unused-schema                                     Removes unreferenced components schema to keep the generated output to a minimum
         --keep-schema                                            Force to keep matching schema, uses regular expressions. Use together with "--trim-unused-schema". Can be set multiple times
+        --include-inheritance-hierarchy                          Keep all possible inherited types/union types even if they are not directly used
         --no-banner                                              Don't show donation banner
         --skip-default-additional-properties                     Set to true to skip default additional properties
         --operation-name-generator              Default          The NSwag IOperationNameGenerator implementation to use.
@@ -211,6 +212,7 @@ The following is an example `.refitter` file
     "^Model$",
     "^Person.+"
   ],
+  "includeInheritanceHierarchy": false, // Optional. Default=false. Set to true to keep all possible type-instances of inheritance/union types. This works in conjunction with trimUnusedSchema.
   "generateDefaultAdditionalProperties": true, // Optional. default=true
   "operationNameGenerator": "Default", // Optional. May be one of Default, MultipleClientsFromOperationId, MultipleClientsFromPathSegments, MultipleClientsFromFirstTagAndOperationId, MultipleClientsFromFirstTagAndOperationName, MultipleClientsFromFirstTagAndPathSegments, SingleClientFromOperationId, SingleClientFromPathSegments
   "immutableRecords": false,
@@ -303,6 +305,7 @@ The following is an example `.refitter` file
 - `optionalParameters` - Generate non-required parameters as nullable optional parameters
 - `trimUnusedSchema` - Removes unreferenced components schema to keep the generated output to a minimum
 - `keepSchemaPatterns`: A collection of regular expressions to force to keep matching schema. This is used together with `trimUnusedSchema`
+- `includeInheritanceHierarchy`: Set to true to keep all possible type-instances of inheritance/union types. If this is false only directly referenced types will be kept. This works in conjunction with `trimUnusedSchema`
 - `generateDefaultAdditionalProperties`: Set to `false` to skip default additional properties. Default is `true`
 - `operationNameGenerator`: The NSwag `IOperationNameGenerator` implementation to use. See https://refitter.github.io/api/Refitter.Core.OperationNameGeneratorTypes.html
 - `immutableRecords`: Set to `true` to generate contracts as immutable records instead of classes. Default is `false`
diff --git a/docs/docfx_project/articles/cli-tool.md b/docs/docfx_project/articles/cli-tool.md
index 8b667081..81d2713b 100644
--- a/docs/docfx_project/articles/cli-tool.md
+++ b/docs/docfx_project/articles/cli-tool.md
@@ -79,6 +79,7 @@ OPTIONS:
         --optional-nullable-parameters                           Generate nullable parameters as optional parameters                                                                                       
         --trim-unused-schema                                     Removes unreferenced components schema to keep the generated output to a minimum                                                          
         --keep-schema                                            Force to keep matching schema, uses regular expressions. Use together with "--trim-unused-schema". Can be set multiple times              
+        --include-inheritance-hierarchy                          Keep all possible inherited types/union types even if they are not directly used                                                          
         --no-banner                                              Don't show donation banner                                                                                                                
         --skip-default-additional-properties                     Set to true to skip default additional properties                                                                                         
         --operation-name-generator              Default          The NSwag IOperationNameGenerator implementation to use.                                                                                  
diff --git a/docs/docfx_project/articles/refitter-file-format.md b/docs/docfx_project/articles/refitter-file-format.md
index 193950b1..d3a5ec1c 100644
--- a/docs/docfx_project/articles/refitter-file-format.md
+++ b/docs/docfx_project/articles/refitter-file-format.md
@@ -151,6 +151,7 @@ The following is an example `.refitter` file
 - `optionalParameters` - Generate non-required parameters as nullable optional parameters
 - `trimUnusedSchema` - Removes unreferenced components schema to keep the generated output to a minimum
 - `keepSchemaPatterns`: A collection of regular expressions to force to keep matching schema. This is used together with `trimUnusedSchema`
+- `includeInheritanceHierarchy`: Set to true to keep all possible type-instances of inheritance/union types. If this is false only directly referenced types will be kept. This works in conjunction with `trimUnusedSchema`
 - `generateDefaultAdditionalProperties`: Set to `false` to skip default additional properties. Default is `true`
 - `operationNameGenerator`: The NSwag `IOperationNameGenerator` implementation to use. See https://refitter.github.io/api/Refitter.Core.OperationNameGeneratorTypes.html
 - `immutableRecords`: Set to `true` to generate contracts as immutable records instead of classes. Default is `false`
diff --git a/src/Refitter/README.md b/src/Refitter/README.md
index 7e9fcbb5..2295094f 100644
--- a/src/Refitter/README.md
+++ b/src/Refitter/README.md
@@ -82,6 +82,7 @@ OPTIONS:
         --optional-nullable-parameters                           Generate nullable parameters as optional parameters
         --trim-unused-schema                                     Removes unreferenced components schema to keep the generated output to a minimum
         --keep-schema                                            Force to keep matching schema, uses regular expressions. Use together with "--trim-unused-schema". Can be set multiple times
+        --include-inheritance-hierarchy                          Keep all possible inherited types/union types even if they are not directly used
         --no-banner                                              Don't show donation banner
         --skip-default-additional-properties                     Set to true to skip default additional properties
         --operation-name-generator              Default          The NSwag IOperationNameGenerator implementation to use.