diff --git a/boxtree/tree_build.py b/boxtree/tree_build.py
index dbf9f52695b2aa899973c7af7e328204b70ce008..bac9ba53d62692be311d15218f146f9ee00cc2ca 100644
--- a/boxtree/tree_build.py
+++ b/boxtree/tree_build.py
@@ -1571,9 +1571,9 @@ class TreeBuilder(object):
             extra_tree_attrs.update(target_radii=target_radii)
 
         tree_build_elapsed = time() - tree_build_start_time
-        logger.info("tree build complete: %d levels, %d boxes, "
+        logger.info("tree build complete: %d levels, %d boxes, %d particles, "
                 "elapsed time: %g s",
-                nlevels, len(box_parent_ids), tree_build_elapsed)
+                nlevels, len(box_parent_ids), nsrcntgts, tree_build_elapsed)
 
         return Tree(
                 # If you change this, also change the documentation