diff --git a/src/main/java/org/jenkinsci/plugins/ghprb/GhprbPullRequest.java b/src/main/java/org/jenkinsci/plugins/ghprb/GhprbPullRequest.java
index 7022a296b..8a8603232 100644
--- a/src/main/java/org/jenkinsci/plugins/ghprb/GhprbPullRequest.java
+++ b/src/main/java/org/jenkinsci/plugins/ghprb/GhprbPullRequest.java
@@ -339,6 +339,7 @@ private void updatePR(GHPullRequest ghpr, GHIssueComment comment, boolean isWebh
                 // check that comment.  Otherwise check the full set since the last
                 // time we updated (which might have just happened).
                 int commentsChecked = 0;
+                //Setting to null fixes ghprbCommentBody containing stale values; ref https://github.com/jenkinsci/ghprb-plugin/pull/504
                 commentBody = null;
                 if (wasUpdated && (!isWebhook || !initialCommentCheckDone)) {
                     initialCommentCheckDone = true;