diff --git a/src/Tests/PhpFilterTest.php b/src/Tests/PhpFilterTest.php
index dd6e95dae72d6e1e61470354604e49dd543a3e54..8b5b521c49e96556bd3dd6bf0243c83dadd88a0d 100644
--- a/src/Tests/PhpFilterTest.php
+++ b/src/Tests/PhpFilterTest.php
@@ -41,7 +41,7 @@ class PhpFilterTest extends PhpTestBase {
     $this->assertNoText('print "SimpleTest PHP was executed!"', "PHP code isn't displayed.");
     $this->assertText('SimpleTest PHP was executed!', 'PHP code has been evaluated.');
 
-    // Cache test.
+    // Verify that cache is disabled for PHP evaluates.
     $this->assertText('Current state is empty', 'PHP code has been evaluated once.');
     \Drupal::state()->set('php_state_test', 'not empty');
     $this->drupalGet('node/' . $node->id());