diff --git a/doc/api/crypto.md b/doc/api/crypto.md
index 0af112727b3f65..a40178db22e6ab 100644
--- a/doc/api/crypto.md
+++ b/doc/api/crypto.md
@@ -544,7 +544,7 @@ const aliceSecret = alice.computeSecret(bobKey);
 const bobSecret = bob.computeSecret(aliceKey);
 
 assert.strictEqual(aliceSecret.toString('hex'), bobSecret.toString('hex'));
-  // OK
+// OK
 ```
 
 ### ecdh.computeSecret(other_public_key[, input_encoding][, output_encoding])
@@ -684,10 +684,11 @@ const hash = crypto.createHash('sha256');
 
 hash.on('readable', () => {
   const data = hash.read();
-  if (data)
+  if (data) {
     console.log(data.toString('hex'));
     // Prints:
     //   6a2da20943931e9834fc12cfe5bb47bbd9ae43489a30726962b576f4e3993e50
+  }
 });
 
 hash.write('some data to hash');
@@ -767,10 +768,11 @@ const hmac = crypto.createHmac('sha256', 'a secret');
 
 hmac.on('readable', () => {
   const data = hmac.read();
-  if (data)
+  if (data) {
     console.log(data.toString('hex'));
     // Prints:
     //   7fd04df92f636fd450bc841c9418e5825c17f33ad9c87c518115a45971f7f77e
+  }
 });
 
 hmac.write('some data to hash');
diff --git a/doc/api/querystring.md b/doc/api/querystring.md
index 3a10604020db90..f1f48fadd5fc29 100644
--- a/doc/api/querystring.md
+++ b/doc/api/querystring.md
@@ -71,7 +71,7 @@ in the following example:
 // Assuming gbkDecodeURIComponent function already exists...
 
 querystring.parse('w=%D6%D0%CE%C4&foo=bar', null, null,
-  { decodeURIComponent: gbkDecodeURIComponent });
+                  { decodeURIComponent: gbkDecodeURIComponent });
 ```
 
 ## querystring.stringify(obj[, sep[, eq[, options]]])
@@ -115,7 +115,7 @@ following example:
 // Assuming gbkEncodeURIComponent function already exists,
 
 querystring.stringify({ w: '中文', foo: 'bar' }, null, null,
-  { encodeURIComponent: gbkEncodeURIComponent });
+                      { encodeURIComponent: gbkEncodeURIComponent });
 ```
 
 ## querystring.unescape(str)
diff --git a/doc/guides/writing-tests.md b/doc/guides/writing-tests.md
index fbb1d55309a44b..64181586b539c4 100644
--- a/doc/guides/writing-tests.md
+++ b/doc/guides/writing-tests.md
@@ -25,13 +25,13 @@ Let's analyze this basic test from the Node.js test suite:
 ```javascript
 'use strict';                                                          // 1
 const common = require('../common');                                   // 2
-                                                                       // 3
+
 // This test ensures that the http-parser can handle UTF-8 characters  // 4
 // in the http header.                                                 // 5
-                                                                       // 6
+
 const assert = require('assert');                                      // 7
 const http = require('http');                                          // 8
-                                                                       // 9
+
 const server = http.createServer(common.mustCall((req, res) => {       // 10
   res.end('ok');                                                       // 11
 }));                                                                   // 12