diff --git a/docs/usage.md b/docs/usage.md
index 3a29bd70..e1b47e44 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -121,11 +121,11 @@ return $.response[200].header("x-coolness-level", 10).text("This is cool!")`.
 
 ### Request parameters
 
-Most of the time, the server's response depends on input from various parts of the request, which are accessible through `$.path`, `$.query`, `$.header`, and `$.body`. The best way to explain is with an example:
+Most of the time, the server's response depends on input from various parts of the request, which are accessible through `$.path`, `$.query`, `$.headers`, and `$.body`. The best way to explain is with an example:
 
 ```ts
 export const GET: HTTP_GET = ($) => {
-    if ($.header['x-token'] !== 'super-secret') {
+    if ($.headers['x-token'] !== 'super-secret') {
        return $.response[401].text('unauthorized');
     }
 
diff --git a/src/server/types.ts b/src/server/types.ts
index 066ec344..20396880 100644
--- a/src/server/types.ts
+++ b/src/server/types.ts
@@ -259,7 +259,7 @@ interface WideResponseBuilder {
 interface WideOperationArgument {
   body: unknown;
   context: unknown;
-  header: { [key: string]: string };
+  headers: { [key: string]: string };
   path: { [key: string]: string };
   proxy: (url: string) => { proxyUrl: string };
   query: { [key: string]: string };
diff --git a/src/typescript-generator/operation-type-coder.js b/src/typescript-generator/operation-type-coder.js
index ffe581ac..8f3fd984 100644
--- a/src/typescript-generator/operation-type-coder.js
+++ b/src/typescript-generator/operation-type-coder.js
@@ -110,7 +110,7 @@ export class OperationTypeCoder extends TypeCoder {
 
     const pathType = new ParametersTypeCoder(parameters, "path").write(script);
 
-    const headerType = new ParametersTypeCoder(parameters, "header").write(
+    const headersType = new ParametersTypeCoder(parameters, "header").write(
       script,
     );
 
@@ -139,7 +139,7 @@ export class OperationTypeCoder extends TypeCoder {
 
     const proxyType = "(url: string) => COUNTERFACT_RESPONSE";
 
-    return `($: OmitValueWhenNever<{ query: ${queryType}, path: ${pathType}, header: ${headerType}, body: ${bodyType}, context: ${contextTypeImportName}, response: ${responseType}, x: ${xType}, proxy: ${proxyType}, user: ${this.userType()} }>) => ${this.responseTypes(
+    return `($: OmitValueWhenNever<{ query: ${queryType}, path: ${pathType}, headers: ${headersType}, body: ${bodyType}, context: ${contextTypeImportName}, response: ${responseType}, x: ${xType}, proxy: ${proxyType}, user: ${this.userType()} }>) => ${this.responseTypes(
       script,
     )} | { status: 415, contentType: "text/plain", body: string } | COUNTERFACT_RESPONSE | { ALL_REMAINING_HEADERS_ARE_OPTIONAL: COUNTERFACT_RESPONSE }`;
   }