diff --git a/course/tests/externallib_test.php b/course/tests/externallib_test.php
index 649d85e5079..b1124ce8156 100644
--- a/course/tests/externallib_test.php
+++ b/course/tests/externallib_test.php
@@ -3031,6 +3031,7 @@ class externallib_test extends externallib_advanced_testcase {
 
     /**
      * Test retrieving courses by field returning communication tools.
+     * @covers \core_course_external::get_courses_by_field
      */
     public function test_get_courses_by_field_communication(): void {
         $this->resetAfterTest();