diff --git a/src/docs/userguide/herald.diviner b/src/docs/userguide/herald.diviner
index f6774f19e8..66272fb325 100644
--- a/src/docs/userguide/herald.diviner
+++ b/src/docs/userguide/herald.diviner
@@ -90,7 +90,7 @@ A few features in Herald are particularly complicated:
   filename of the changed file; the second will be used to match the content.
   For example, if you want to match revisions which add or remove calls to
   a "muffinize" function, //but only in JS files//, you can set the value
-  to ##["/\.js$/", "/muffinize/"]## or similar.
+  to ##["/\\.js$/", "/muffinize/"]## or similar.
   - **Another Herald rule**: you can create Herald rules which depend on other
   rules. This can be useful if you need to express a more complicated predicate
   than "all" vs "any" allows, or have a common set of conditions which you want