diff --git a/.spelling b/.spelling
index e783cbf79a..fe989424fa 100644
--- a/.spelling
+++ b/.spelling
@@ -107,7 +107,7 @@ LoadBalancer
 LoadBalancers
 LoadBalancing.svg
 Lyft
-MacOS
+macOS
 Manolache
 Memquota
 Mesos
diff --git a/content/docs/setup/consul/quick-start/index.md b/content/docs/setup/consul/quick-start/index.md
index 0600035ebc..a2eedfb469 100644
--- a/content/docs/setup/consul/quick-start/index.md
+++ b/content/docs/setup/consul/quick-start/index.md
@@ -15,7 +15,7 @@ Quick Start instructions to install and configure Istio in a Docker Compose setu
 ## Installation steps
 
 1.  Go to the [Istio release](https://github.com/istio/istio/releases) page to download the
-    installation file corresponding to your OS. If you are using a MacOS or Linux system, you can also
+    installation file corresponding to your OS. If you are using a macOS or Linux system, you can also
     run the following command to download and extract the latest release automatically:
 
     ```command
@@ -30,7 +30,7 @@ installation directory contains:
     * The `istio.VERSION` configuration file
 
 1.  Add the `istioctl` client to your PATH.
-For example, run the following command on a MacOS or Linux system:
+For example, run the following command on a macOS or Linux system:
 
     ```command
     $ export PATH=$PWD/bin:$PATH
diff --git a/content/docs/setup/eureka/quick-start/index.md b/content/docs/setup/eureka/quick-start/index.md
index 63ce6a11b9..d65387b57f 100644
--- a/content/docs/setup/eureka/quick-start/index.md
+++ b/content/docs/setup/eureka/quick-start/index.md
@@ -15,7 +15,7 @@ Quick Start instructions to install and configure Istio in a Docker Compose setu
 ## Installation steps
 
 1.  Go to the [Istio release](https://github.com/istio/istio/releases) page to download the
-installation file corresponding to your OS. If you are using a MacOS or Linux system, you can also
+installation file corresponding to your OS. If you are using a macOS or Linux system, you can also
 run the following command to download and extract the latest release automatically:
 
     ```command
@@ -30,7 +30,7 @@ installation directory contains:
     * The `istio.VERSION` configuration file
 
 1.  Add the `istioctl` client to your PATH.
-For example, run the following command on a MacOS or Linux system:
+For example, run the following command on a macOS or Linux system:
 
     ```command
     $ export PATH=$PWD/bin:$PATH
diff --git a/content/docs/setup/kubernetes/quick-start/index.md b/content/docs/setup/kubernetes/quick-start/index.md
index 6c5cdc79f5..94463c18d4 100644
--- a/content/docs/setup/kubernetes/quick-start/index.md
+++ b/content/docs/setup/kubernetes/quick-start/index.md
@@ -224,7 +224,7 @@ Istio is installed in its own `istio-system` namespace and can manage
 services from all other namespaces.
 
 1.  Go to the [Istio release](https://github.com/istio/istio/releases) page to download the
-installation file corresponding to your OS. If you are using a MacOS or Linux system, you can also
+installation file corresponding to your OS. If you are using a macOS or Linux system, you can also
 run the following command to download and extract the latest release automatically:
 
     ```command
@@ -246,7 +246,7 @@ installation directory contains:
     ```
 
 1.  Add the `istioctl` client to your PATH.
-For example, run the following command on a MacOS or Linux system:
+For example, run the following command on a macOS or Linux system:
 
     ```command
     $ export PATH=$PWD/bin:$PATH
diff --git a/content_zh/docs/setup/kubernetes/quick-start/index.md b/content_zh/docs/setup/kubernetes/quick-start/index.md
index 2ff8ebcefb..dc9048303d 100644
--- a/content_zh/docs/setup/kubernetes/quick-start/index.md
+++ b/content_zh/docs/setup/kubernetes/quick-start/index.md
@@ -222,7 +222,7 @@ $ kubectl describe pod --namespace kube-system $(kubectl get pods --namespace ku
 
 从 0.2 版本开始，Istio 安装到 `istio-system` namespace 下，即可以管理所有其它 namespace 下的微服务。
 
-1. 到 [Istio release](https://github.com/istio/istio/releases) 页面上，根据您的操作系统下载对应的发行版。如果您使用的是 MacOS 或者 Linux 系统，可以使用下面的额命令自动下载和解压最新的发行版：
+1. 到 [Istio release](https://github.com/istio/istio/releases) 页面上，根据您的操作系统下载对应的发行版。如果您使用的是 macOS 或者 Linux 系统，可以使用下面的额命令自动下载和解压最新的发行版：
 
     ```command
     $ curl -L https://git.io/getLatestIstio | sh -
@@ -242,7 +242,7 @@ $ kubectl describe pod --namespace kube-system $(kubectl get pods --namespace ku
     ```
 
 1. 将 `istioctl` 客户端二进制文件加到 PATH 中。
-  例如，在 MacOS 或 Linux 系统上执行下面的命令：
+  例如，在 macOS 或 Linux 系统上执行下面的命令：
 
     ```command
     $ export PATH=$PWD/bin:$PATH