diff --git a/docs/PrivateKey.md b/docs/PrivateKey.md
index bbf51b390..4b6cf7be1 100644
--- a/docs/PrivateKey.md
+++ b/docs/PrivateKey.md
@@ -43,7 +43,7 @@ The code to do these validations looks like this:
 ```javascript
 
 // validate an address
-if (PrivateKey.isValid(input){
+if (PrivateKey.isValid(input)){
   ...
 }