diff --git a/doc/ci/yaml/inputs.md b/doc/ci/yaml/inputs.md
index 1af53d666ce407189c0eadd4ca346b4c996d8999..0eb8278fc48c3aa9305f541e4efec004f9452192 100644
--- a/doc/ci/yaml/inputs.md
+++ b/doc/ci/yaml/inputs.md
@@ -14,6 +14,8 @@ and subject to change without notice.
 
 ## Define input parameters with `spec:inputs`
 
+> `description` keyword [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/415637) in GitLab 16.5.
+
 Use `spec:inputs` to define input parameters for CI/CD configuration intended to be added
 to a pipeline with `include`. Use [`include:inputs`](#set-input-parameter-values-with-includeinputs)
 to define the values to use when the pipeline runs.
@@ -41,6 +43,7 @@ When using `spec:inputs`:
 
 - Defined inputs are mandatory by default.
 - Inputs can be made optional by specifying a `default`. Use `default: null` to have no default value.
+- You can optionally use `description` to give a description to a specific input.
 - A string containing an interpolation block must not exceed 1 MB.
 - The string inside an interpolation block must not exceed 1 KB.
 
@@ -54,6 +57,7 @@ spec:
       default: 'test-user'
     flags:
       default: null
+      description: 'Sample description of the `flags` input detail.'
 ---
 
 # The pipeline configuration would follow...
@@ -63,7 +67,7 @@ In this example:
 
 - `website` is mandatory and must be defined.
 - `user` is optional. If not defined, the value is `test-user`.
-- `flags` is optional. If not defined, it has no value.
+- `flags` is optional. If not defined, it has no value. The optional description should give details about the input.
 
 ## Set input parameter values with `include:inputs`
 
@@ -85,8 +89,6 @@ include:
 In this example:
 
 - `website` has a value of `My website` for the included configuration.
-- `user` has a value of `test-user`, because that is the default when not specified.
-- `flags` has no value, because it is optional and has no default when not specified.
 
 ### Use `include:inputs` with multiple files
 
diff --git a/lib/gitlab/ci/config/header/input.rb b/lib/gitlab/ci/config/header/input.rb
index 76a89a3080eae3b547fa205bc539e887e2089703..ed293cb6f4b6ccdec176cd7f90c6a5ed71327ec2 100644
--- a/lib/gitlab/ci/config/header/input.rb
+++ b/lib/gitlab/ci/config/header/input.rb
@@ -11,13 +11,14 @@ class Input < ::Gitlab::Config::Entry::Node
           include ::Gitlab::Config::Entry::Validatable
           include ::Gitlab::Config::Entry::Attributable
 
-          attributes :default, :type, prefix: :input
+          attributes :default, :description, :type, prefix: :input
 
           validations do
-            validates :config, type: Hash, allowed_keys: [:default, :type]
+            validates :config, type: Hash, allowed_keys: [:default, :type, :description]
             validates :key, alphanumeric: true
             validates :input_default, alphanumeric: true, allow_nil: true
             validates :input_type, allow_nil: true, allowed_values: Interpolation::Inputs.input_types
+            validates :input_description, alphanumeric: true, allow_nil: true
           end
         end
       end
diff --git a/spec/lib/gitlab/ci/config/header/input_spec.rb b/spec/lib/gitlab/ci/config/header/input_spec.rb
index b5155dff6e8aef2823c1fb215887bb57c8c8dece..b4e02c2b005012f743ddac10ae447fecdfc56d59 100644
--- a/spec/lib/gitlab/ci/config/header/input_spec.rb
+++ b/spec/lib/gitlab/ci/config/header/input_spec.rb
@@ -46,6 +46,12 @@
     it_behaves_like 'a valid input'
   end
 
+  context 'when has a description value' do
+    let(:input_hash) { { description: 'bar' } }
+
+    it_behaves_like 'a valid input'
+  end
+
   context 'when is a required input' do
     let(:input_hash) { nil }
 
diff --git a/spec/services/ci/create_pipeline_service_spec.rb b/spec/services/ci/create_pipeline_service_spec.rb
index a28dd9e7a556335c5055d1165455b557c5d0e033..11f9708f9f3d536a64297997d3b84ed29c118fe6 100644
--- a/spec/services/ci/create_pipeline_service_spec.rb
+++ b/spec/services/ci/create_pipeline_service_spec.rb
@@ -1953,6 +1953,32 @@ def previous_commit_sha_from_ref(ref)
             expect(pipeline.statuses.count).to eq 2
             expect(pipeline.statuses.map(&:name)).to match_array %w[test-1 test-my-job]
           end
+
+          context 'when inputs have a description' do
+            let(:template) do
+              <<~YAML
+                spec:
+                  inputs:
+                    stage:
+                    suffix:
+                      default: my-job
+                      description: description
+                ---
+                test-$[[ inputs.suffix ]]:
+                  stage: $[[ inputs.stage ]]
+                  script: run tests
+              YAML
+            end
+
+            it 'creates a pipeline' do
+              response = execute_service(save_on_errors: true)
+
+              pipeline = response.payload
+
+              expect(pipeline).to be_persisted
+              expect(pipeline.yaml_errors).to be_blank
+            end
+          end
         end
 
         context 'when interpolation is invalid' do