--- sbcl-1.1.18/doc/internals/discriminating-functions.dot.old	2016-03-18 18:40:54.297597061 -0700
+++ sbcl-1.1.18/doc/internals/discriminating-functions.dot	2016-03-18 18:41:29.912053235 -0700
@@ -33,13 +33,13 @@
 // oneindex -> dispatch
 // nn -> caching
 // nn -> checking
 // nn -> dispatch
 
-subgraph class -> caching
-subgraph class -> checking
-subgraph class -> dispatch
+subgraph { class -> caching }
+subgraph { class -> checking }
+subgraph { class -> dispatch }
 
 initial -> oneclass
 
 initial -> default
 initial -> nomethods