diff --git a/packages/proto-loader/src/index.ts b/packages/proto-loader/src/index.ts
index a407e005..563f58f5 100644
--- a/packages/proto-loader/src/index.ts
+++ b/packages/proto-loader/src/index.ts
@@ -270,8 +270,8 @@ function addIncludePathResolver(root: Protobuf.Root, includePaths: string[]) {
 
 /**
  * Load a .proto file with the specified options.
- * @param filename The file path to load. Can be an absolute path or relative to
- *     an include path.
+ * @param filename One or multiple file paths to load. Can be an absolute path
+ *     or relative to an include path.
  * @param options.keepCase Preserve field names. The default is to change them
  *     to camel case.
  * @param options.longs The type that should be used to represent `long` values.
@@ -293,7 +293,7 @@ function addIncludePathResolver(root: Protobuf.Root, includePaths: string[]) {
  * @param options.includeDirs Paths to search for imported `.proto` files.
  */
 export function load(
-    filename: string, options?: Options): Promise<PackageDefinition> {
+    filename: string | string[], options?: Options): Promise<PackageDefinition> {
   const root: Protobuf.Root = new Protobuf.Root();
   options = options || {};
   if (!!options.includeDirs) {
@@ -310,7 +310,7 @@ export function load(
 }
 
 export function loadSync(
-    filename: string, options?: Options): PackageDefinition {
+    filename: string | string[], options?: Options): PackageDefinition {
   const root: Protobuf.Root = new Protobuf.Root();
   options = options || {};
   if (!!options.includeDirs) {