diff --git a/README.md b/README.md
index 5d52da6..a6d91d4 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ $ composer require --dev smeghead/php-class-diagram
 ```
 
 Now, you can execute `./vendor/bin/php-class-diagram`.
-for instance, try to display help message.
+For instance, try to display help message.
 
 ```bash
 $ vendor/bin/php-class-diagram --help
@@ -75,7 +75,7 @@ OPTIONS
       --disable-class-name-summary describe classname without Class summary of document comment.
       --php5                     parse php source file as php5.
       --php7                     parse php source file as php7.
-      --php8                     parse php source file as php8. (not suppoted)
+      --php8                     parse php source file as php8. (not supported)
       --header='header string'   additional header string. You can specify multiple header values.
       --include='wildcard'       include target file pattern. (default: `*.php`) You can specify multiple include patterns.
       --exclude='wildcard'       exclude target file pattern. You can specify multiple exclude patterns.
@@ -152,7 +152,7 @@ $ vendor/bin/php-class-diagram test/fixtures/no-namespace
 @enduml
 ```
 
-Use PlnatUML to convert the PlantUML script to an image.
+Use PlantUML to convert the PlantUML script to an image.
 
 ![PlantUML output image.](doc/images/output.png)