diff --git a/test/parallel/test-fs-readfile-empty.js b/test/parallel/test-fs-readfile-empty.js
index 632bab5ec8b4fe..ac8d4755d3ff9f 100644
--- a/test/parallel/test-fs-readfile-empty.js
+++ b/test/parallel/test-fs-readfile-empty.js
@@ -1,5 +1,8 @@
 'use strict';
 require('../common');
+
+// Trivial test of fs.readFile on an empty file.
+
 const assert = require('assert');
 const fs = require('fs');
 const fixtures = require('../common/fixtures');
diff --git a/test/parallel/test-fs-readfile-error.js b/test/parallel/test-fs-readfile-error.js
index 7c8dd8feb6a770..752339d909ad45 100644
--- a/test/parallel/test-fs-readfile-error.js
+++ b/test/parallel/test-fs-readfile-error.js
@@ -1,5 +1,8 @@
 'use strict';
 const common = require('../common');
+
+// Test that fs.readFile fails correctly on a non-existent file.
+
 // `fs.readFile('/')` does not fail on FreeBSD, because you can open and read
 // the directory there.
 if (common.isFreeBSD)
diff --git a/test/parallel/test-fs-readfile-fd.js b/test/parallel/test-fs-readfile-fd.js
index decd578d704bf6..c0e19a63d27ddf 100644
--- a/test/parallel/test-fs-readfile-fd.js
+++ b/test/parallel/test-fs-readfile-fd.js
@@ -1,5 +1,8 @@
 'use strict';
 require('../common');
+
+// Test fs.readFile using a file descriptor.
+
 const fixtures = require('../common/fixtures');
 const assert = require('assert');
 const fs = require('fs');
diff --git a/test/parallel/test-fs-readfile-unlink.js b/test/parallel/test-fs-readfile-unlink.js
index 203ea681e5a079..c0e51b9866d4fe 100644
--- a/test/parallel/test-fs-readfile-unlink.js
+++ b/test/parallel/test-fs-readfile-unlink.js
@@ -1,5 +1,8 @@
 'use strict';
 const common = require('../common');
+
+// Test that unlink succeeds immediately after readFile completes.
+
 const assert = require('assert');
 const fs = require('fs');
 const path = require('path');
diff --git a/test/parallel/test-fs-readfile-zero-byte-liar.js b/test/parallel/test-fs-readfile-zero-byte-liar.js
index 82037a77e62122..182462d647a0dc 100644
--- a/test/parallel/test-fs-readfile-zero-byte-liar.js
+++ b/test/parallel/test-fs-readfile-zero-byte-liar.js
@@ -1,5 +1,8 @@
 'use strict';
 const common = require('../common');
+
+// Test that readFile works even when stat returns size 0.
+
 const assert = require('assert');
 const fs = require('fs');