diff --git a/project/cross-compile/README.md b/project/cross-compile/README.md
index 6c894aac7..cf1a2fe95 100644
--- a/project/cross-compile/README.md
+++ b/project/cross-compile/README.md
@@ -2,4 +2,4 @@
 * 需要判断是否用到NEON时，使用`#ifdef MNN_USE_NEON`。不要直接判断是否为arm，有些arm是不支持neon的。
 
 ## 交叉编译
-* 在项目根目录种调用`./project/cross-compile/build.sh`。
+* 在项目根目录中调用`./project/cross-compile/build.sh`。
diff --git a/tools/converter/README.md b/tools/converter/README.md
index 42896d823..0effafe19 100644
--- a/tools/converter/README.md
+++ b/tools/converter/README.md
@@ -5,7 +5,7 @@
 ## Compile Model Convert Tools(gcc>=4.9)
 Firstly you need to install protobuf (version>3.0)
 ```bash
-# MacOS
+# macOS
 brew install protobuf
 ```
 Look up the [official document of installation](https://github.com/protocolbuffers/protobuf/tree/master/src) for other platforms.
diff --git a/tools/converter/README_CN.md b/tools/converter/README_CN.md
index f539b7069..283934af4 100644
--- a/tools/converter/README_CN.md
+++ b/tools/converter/README_CN.md
@@ -5,7 +5,7 @@
 ## 编译模型转换工具(gcc>=4.9)
 首先需要安装protobuf(3.0以上)
 ```bash
-# MacOS
+# macOS
 brew install protobuf
 ```
 其它平台请参考[官方安装步骤](https://github.com/protocolbuffers/protobuf/tree/master/src)