diff --git a/Orange/widgets/visualize/owtreeviewer.py b/Orange/widgets/visualize/owtreeviewer.py
index e24922b6031..d7c970f4548 100644
--- a/Orange/widgets/visualize/owtreeviewer.py
+++ b/Orange/widgets/visualize/owtreeviewer.py
@@ -358,7 +358,7 @@ def update_node_info_cls(self, node):
         else:
             modus = np.argmax(distr)
             tabs = distr[modus]
-            text = f"{self.domain.class_vars[0].values[int(modus)]}<br/>"
+            text = f"<b>{self.domain.class_vars[0].values[int(modus)]}</b><br/>"
         if tabs > 0.999:
             text += f"100%, {total}/{total}"
         else:
@@ -373,7 +373,7 @@ def update_node_info_reg(self, node):
         node_inst = node.node_inst
         mean, var = self.tree_adapter.get_distribution(node_inst)[0]
         insts = self.tree_adapter.num_samples(node_inst)
-        text = f"{mean:.1f} ± {var:.1f}<br/>"
+        text = f"<b>{mean:.1f}</b> ± {var:.1f}<br/>"
         text += f"{insts} instances"
         text = self._update_node_info_attr_name(node, text)
         node.setHtml(