diff --git a/src/index.mjs b/src/index.mjs
index 2ae2f9d..5aa3c09 100644
--- a/src/index.mjs
+++ b/src/index.mjs
@@ -38,9 +38,18 @@ async function ghActionBot() {
     comments.map(async comment => {
       const pull = await getPull(repo, comment.number);
 
-      if (pull.state !== 'open') return false; // filter out any closed pulls
-      if (PULL_AUTHOR_FILTER && !pull.owner !== PULL_AUTHOR_FILTER) return false; // filter on owner
-      if (PULL_LABEL_FILTER && !pull.labels.includes(PULL_LABEL_FILTER)) return false; // filter on label
+      if (pull.state !== 'open') {
+        logger.debug(`SKIP #${pull.number}: state is ${pull.state}`);
+        return false; // filter out any closed pulls
+      }
+      if (PULL_AUTHOR_FILTER && !pull.owner !== PULL_AUTHOR_FILTER) {
+        logger.debug(`SKIP #${pull.number}: author is ${pull.owner}`);
+        return false; // filter on owner
+      }
+      if (PULL_LABEL_FILTER && !pull.labels.includes(PULL_LABEL_FILTER)) {
+        logger.debug(`SKIP #${pull.number}: labels are ${pull.labels.join(',')}`);
+        return false; // filter on label
+      }
 
       return { comment, pull };
     })
@@ -51,18 +60,25 @@ async function ghActionBot() {
       const commit = await getCommits(repo, pull.number, true);
       const buildStatus = await getCommitStatus(repo, commit.sha);
       // do nothing if the build has not started, or is pending or successful
-      if (!buildStatus || buildStatus.state === 'pending' || buildStatus.state === 'success')
+      if (!buildStatus || buildStatus.state === 'pending' || buildStatus.state === 'success') {
+        logger.debug(`SKIP #${pull.number}: build status is ${buildStatus.state}`);
         return false;
+      }
       return { comment, pull, commit, buildStatus };
     })
   )).filter(Boolean);
 
-  logger.log(`Found ${records.length} outstanding failures`);
+  if (records.length) {
+    logger.log(`Found ${records.length} outstanding failures`);
+  } else {
+    logger.debug(`Found ${records.length} outstanding failures`);
+  }
 
   await Promise.all(
     records.map(async record => {
       logger.log(`Re-testing PR #${record.pull.number}`);
       const comment = await createComment(repo, records[0].pull.number, PULL_RETEST_BODY);
+      logger.debug(`Created comment id ${comment.id}`);
       await deleteComment(repo, comment.id);
     })
   );