diff --git a/book/art/runtime.bob b/book/art/runtime.bob
index ef61ca17cc..a483a7d7e7 100644
--- a/book/art/runtime.bob
+++ b/book/art/runtime.bob
@@ -1,9 +1,9 @@
 
-+-----------+    +-------------+    +--------------+    +--------------------+    
-| sigverify |--->| lock memory |--->| validate fee |--->| allocate accounts  |--->
-+-----------+    +-------------+    +--------------+    +--------------------+    
+.-----------.    .-------------.    .--------------.    .--------------------.    
+| sigverify +--->| lock memory +--->| validate fee +--->| allocate accounts  +--->
+`-----------`    `-------------`    `--------------`    `--------------------`    
                                 
-    +------------+    +---------+    +-=------------+   +--------------+
---->| load data  |--->| execute |--->| commit data  |-->|unlock memory |
-    +------------+    +---------+    +--------------+   +--------------+
+    .------------.    .---------.    .--------------.   .--------------.
+--->| load data  +--->| execute +--->| commit data  +-->|unlock memory |
+    `------------`    `---------`    `--------------`   `--------------`