diff --git a/lib/platform/github/index.js b/lib/platform/github/index.js
index 2c76964f6d1e969c339d858a59748d1b4edacf1a..ab8bfe9f24c5d87c20e76cecd2c0cc43a9b6cbce 100644
--- a/lib/platform/github/index.js
+++ b/lib/platform/github/index.js
@@ -482,7 +482,9 @@ async function ensureCommentRemoval(issueNo, topic) {
 // Pull Request
 
 async function getPrList() {
+  logger.debug('getPrList()');
   if (!config.prList) {
+    logger.debug('Retrieving PR list');
     const res = await get(
       `repos/${config.repoName}/pulls?per_page=100&state=all`,
       { paginate: true }
@@ -501,12 +503,16 @@ async function getPrList() {
 async function findPr(branchName, prTitle, state = 'all') {
   logger.debug(`findPr(${branchName}, ${prTitle}, ${state})`);
   const prList = await getPrList();
-  return prList.find(
+  const pr = prList.find(
     p =>
       p.branchName === branchName &&
       (!prTitle || p.title === prTitle) &&
       (state === 'all' || p.state === state)
   );
+  if (pr) {
+    logger.debug(`Found PR #${pr.number}`);
+  }
+  return pr;
 }
 
 // Creates PR and returns PR number