diff --git a/docs/how-to-work-on-coding-challenges.md b/docs/how-to-work-on-coding-challenges.md
index 45e8c91aee..b618d50d93 100644
--- a/docs/how-to-work-on-coding-challenges.md
+++ b/docs/how-to-work-on-coding-challenges.md
@@ -16,7 +16,7 @@ Here is a template of what the challenge markdown files look like.
 
 ````md
 ---
-id: Unique identifier (alphanumerical, MongoDB _id)
+id: Unique identifier (alphanumerical, MongoDB_id)
 title: Challenge Title
 challengeType: 0
 guideUrl: 'url of guide article'