diff --git a/doc/api/errors.md b/doc/api/errors.md
index 5aa39baadd0674..5b8fb7875a7e4b 100644
--- a/doc/api/errors.md
+++ b/doc/api/errors.md
@@ -1224,7 +1224,7 @@ Example
 const Socket = require('net').Socket;
 const instance = new Socket();
 
-instance.setEncoding('utf-8');
+instance.setEncoding('utf8');
 ```
 
 <a id="ERR_TLS_CERT_ALTNAME_INVALID"></a>
diff --git a/doc/api/fs.md b/doc/api/fs.md
index 6e643190584011..ccb2b35a2e967c 100644
--- a/doc/api/fs.md
+++ b/doc/api/fs.md
@@ -1284,7 +1284,7 @@ If the file previously was shorter than `len` bytes, it is extended, and the
 extended part is filled with null bytes ('\0'). For example,
 
 ```js
-console.log(fs.readFileSync('temp.txt', 'utf-8'));
+console.log(fs.readFileSync('temp.txt', 'utf8'));
 // Prints: Node.js
 
 // get the file descriptor of the file to be truncated