diff --git a/src/protocols/workers/SharedWorkerAcceptor.ts b/src/protocols/workers/SharedWorkerAcceptor.ts
index 87e7bbd..816bc70 100644
--- a/src/protocols/workers/SharedWorkerAcceptor.ts
+++ b/src/protocols/workers/SharedWorkerAcceptor.ts
@@ -29,7 +29,7 @@ import { IWorkerSystem } from "./internal/IWorkerSystem";
  * generic arguments; `Header`, `Provider` and `Remote`. Those generic arguments must
  * be same with the ones defined in the {@link SharedWorkerServer} class.
  *
- * For reference, the first `Header` type repersents an initial data from the
+ * For reference, the first `Header` type represents an initial data from the
  * remote client after the connection. I recommend utilize it as an activation tool
  * for security enhancement. The second generic argument `Provider` represents a
  * provider from server to client, and the other `Remote` means a provider from the
diff --git a/src/protocols/workers/WorkerConnector.ts b/src/protocols/workers/WorkerConnector.ts
index ed83ab5..b4e6120 100644
--- a/src/protocols/workers/WorkerConnector.ts
+++ b/src/protocols/workers/WorkerConnector.ts
@@ -31,7 +31,7 @@ import { WebWorkerCompiler } from "./internal/WebWorkerCompiler";
  * be same with the ones defined in the target {@link WorkerServer} class
  * (`Provider` and `Remote` must be reversed).
  *
- * For reference, the first `Header` type repersents an initial data from the
+ * For reference, the first `Header` type represents an initial data from the
  * remote client after the connection. I recommend utilize it as an activation tool
  * for security enhancement. The second generic argument `Provider` represents a
  * provider from client to server, and the other `Remote` means a provider from the
@@ -106,7 +106,7 @@ export class WorkerConnector<
     options: Partial<WorkerConnector.IConnectOptions> = {},
   ): Promise<void> {
     //----
-    // PRELIMINIARIES
+    // PRELIMINARIES
     //----
     // TEST CONDITION
     this._Test_connection("compile");
diff --git a/src/protocols/workers/internal/IWorkerSystem.ts b/src/protocols/workers/internal/IWorkerSystem.ts
index 1670a20..d5fccdd 100644
--- a/src/protocols/workers/internal/IWorkerSystem.ts
+++ b/src/protocols/workers/internal/IWorkerSystem.ts
@@ -22,9 +22,9 @@ export interface IWorkerSystem {
    *
    * Close connection between the remote worker system.
    *
-   * It destroies all RFCs (remote function calls) between this and the remote system
+   * It destroys all RFCs (remote function calls) between this and the remote system
    * (through `Driver<Controller>`) that are not returned (completed) yet. The destruction
-   * causes all incompleted RFCs to throw exceptions.
+   * causes all incomplete RFCs to throw exceptions.
    */
   close(): Promise<void>;
 }
diff --git a/test/providers/Calculator.ts b/test/providers/Calculator.ts
index 9a0e252..d295565 100644
--- a/test/providers/Calculator.ts
+++ b/test/providers/Calculator.ts
@@ -38,7 +38,7 @@ export class Scientific implements IScientific {
   }
 
   public sqrt(x: number): number {
-    if (x < 0) throw new Error("Negative value on sqaure.");
+    if (x < 0) throw new Error("Negative value on square.");
     return Math.sqrt(x);
   }
 }