diff --git a/go/ql/lib/semmle/go/frameworks/XPath.qll b/go/ql/lib/semmle/go/frameworks/XPath.qll
index a6d19009bf4..0d8dc5d8176 100644
--- a/go/ql/lib/semmle/go/frameworks/XPath.qll
+++ b/go/ql/lib/semmle/go/frameworks/XPath.qll
@@ -30,6 +30,7 @@ module XPath {
     }
   }
 
+  /** A sanitizer for XPath injection. */
   abstract class Sanitizer extends DataFlow::Node { }
 
   private class ExternalSanitizer extends Sanitizer {