diff --git a/README-zh.md b/README-zh.md
index 8a59010..405225d 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -195,8 +195,8 @@ hotkeys('*','wcj', function(e){
 
 #### option 
 
-- scope<String>  
-- element<HTMLElement>  
+- `scope<String>`
+- `element<HTMLElement>`
 
 ```js
 hotkeys('o, enter', {
diff --git a/README.md b/README.md
index 345b718..7b1f0e1 100644
--- a/README.md
+++ b/README.md
@@ -153,8 +153,8 @@ hotkeys('*','wcj', function(e){
 
 #### option 
 
-- scope<String>  
-- element<HTMLElement>  
+- `scope<String>`
+- `element<HTMLElement>`
 
 ```js
 hotkeys('o, enter', {
diff --git a/website/doc.md b/website/doc.md
index 8c97077..ea0cf5e 100644
--- a/website/doc.md
+++ b/website/doc.md
@@ -143,8 +143,8 @@ hotkeys('*','wcj', function(e){
 
 #### option 
 
-- scope<String>  
-- element<HTMLElement>  
+- `scope<String>`
+- `element<HTMLElement>`
 
 ```js
 hotkeys('o, enter', {