diff --git a/packages/express/src/snapshot/zod/v1/types.ts b/packages/express/src/snapshot/zod/v1/types.ts
index 869e6e1..1aa8292 100644
--- a/packages/express/src/snapshot/zod/v1/types.ts
+++ b/packages/express/src/snapshot/zod/v1/types.ts
@@ -135,6 +135,7 @@ export type ExhaustiveParamsParams = {
 };
 
 export type GetGizmosParams = {
+  /** @deprecated */
   search?: string;
 };
 
diff --git a/packages/http-client/src/snapshot/zod/v1/types.ts b/packages/http-client/src/snapshot/zod/v1/types.ts
index 869e6e1..1aa8292 100644
--- a/packages/http-client/src/snapshot/zod/v1/types.ts
+++ b/packages/http-client/src/snapshot/zod/v1/types.ts
@@ -135,6 +135,7 @@ export type ExhaustiveParamsParams = {
 };
 
 export type GetGizmosParams = {
+  /** @deprecated */
   search?: string;
 };
 
diff --git a/packages/typescript/src/interface-factory.ts b/packages/typescript/src/interface-factory.ts
index 62238fa..1522580 100644
--- a/packages/typescript/src/interface-factory.ts
+++ b/packages/typescript/src/interface-factory.ts
@@ -376,9 +376,7 @@ function* internalBuildParamsType(
   yield '{';
 
   for (const param of sortedParams) {
-    if (param.description) {
-      yield* buildDescription(param.description, param.deprecated?.value);
-    }
+    yield* buildDescription(param.description, param.deprecated?.value);
 
     yield `    ${buildParameterName(param)}${
       isRequired(param.value) ? '' : '?'
diff --git a/packages/typescript/src/spec/4.1-structure/4.1.15-parameter.spec.ts b/packages/typescript/src/spec/4.1-structure/4.1.15-parameter.spec.ts
index 590034d..67994ec 100644
--- a/packages/typescript/src/spec/4.1-structure/4.1.15-parameter.spec.ts
+++ b/packages/typescript/src/spec/4.1-structure/4.1.15-parameter.spec.ts
@@ -132,9 +132,7 @@ describe('4.1.15 Parameter', () => {
     });
   });
 
-  // TODO: fix and enable these tests
-  // https://github.com/basketry/typescript/issues/136
-  describe.skip('deprecated', () => {
+  describe('deprecated', () => {
     it('creates a parameter marked as deprecated', async () => {
       // ARRANGE
       const service = sut(
@@ -174,6 +172,7 @@ describe('4.1.15 Parameter', () => {
           value: ir.primitiveValue({
             typeName: ir.primitiveLiteral('string'),
           }),
+          deprecated: ir.trueLiteral(),
         }),
       );