diff --git a/main.go b/main.go
index 08dba11..220c3e0 100644
--- a/main.go
+++ b/main.go
@@ -203,10 +203,11 @@ func pollSource(ctx context.Context, source string, interval time.Duration, cach
 func runOnce(ctx context.Context, source string, cacheDir string, agg *Aggregator, client *http.Client) {
 	links, err := fetchSource(ctx, source, client)
 	if err != nil {
-		log.Printf("poll %s: %v", source, err)
+		log.Printf("poll %s: failed - %v", source, err)
 		return
 	}
 	if len(links) == 0 {
+		log.Printf("poll %s: success - 0 links", source)
 		agg.Update(source, nil)
 		if err := writeCache(cacheDir, source, nil); err != nil {
 			log.Printf("write cache %s: %v", source, err)
@@ -214,6 +215,7 @@ func runOnce(ctx context.Context, source string, cacheDir string, agg *Aggregato
 		return
 	}
 
+	log.Printf("poll %s: success - %d links", source, len(links))
 	agg.Update(source, links)
 	if err := writeCache(cacheDir, source, links); err != nil {
 		log.Printf("write cache %s: %v", source, err)
@@ -240,6 +242,7 @@ func fetchSource(ctx context.Context, source string, client *http.Client) ([]str
 		if resp.StatusCode < 200 || resp.StatusCode >= 300 {
 			return nil, fmt.Errorf("unexpected status: %s", resp.Status)
 		}
+		log.Printf("fetch %s: HTTP %d", source, resp.StatusCode)
 		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			return nil, fmt.Errorf("read body: %w", err)
@@ -254,6 +257,7 @@ func fetchSource(ctx context.Context, source string, client *http.Client) ([]str
 		if err != nil {
 			return nil, fmt.Errorf("read file: %w", err)
 		}
+		log.Printf("fetch %s: file read %d bytes", source, len(data))
 		return normalizeLinks(string(data)), nil
 	default:
 		return nil, fmt.Errorf("unsupported source scheme: %s", u.Scheme)