diff --git a/test/corpus/comments.txt b/test/corpus/comments.txt
index 037597f6f..7255b4ebc 100644
--- a/test/corpus/comments.txt
+++ b/test/corpus/comments.txt
@@ -5,6 +5,12 @@ comment
 // This is a comment
 /* This is also a comment */
 /* this comment /* // /** ends here: */
+/**
+  * Is [:true:] if this comment is a documentation comment.
+  *
+  * That is, that the comment is either enclosed in [: /** ... */ :] or starts
+  * with [: /// :].
+  */
 
 ---