diff --git a/particles/progress_bar.c b/particles/progress_bar.c
index a6e8b59..0d77133 100644
--- a/particles/progress_bar.c
+++ b/particles/progress_bar.c
@@ -94,6 +94,8 @@ instantiate(const struct particle *particle, const struct tag_set *tags)
     long min = tag->min(tag);
     long max = tag->max(tag);
 
+    LOG_DBG("%s: value=%ld, min=%ld, max=%ld", tag->name(tag), value, min, max);
+
     long fill_count = max == min ? 0 : p->width * value / (max - min);
     long empty_count = p->width - fill_count;