tweak doc

speedo-sp7 · Mar 30, 2016 · 91560f7 · 91560f7
1 parent 3d21617
commit 91560f7
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/doc/options.md b/doc/options.md
@@ -58,7 +58,8 @@ $ antlr4 T2.g4
 $ grep MyToken T2Parser.java
     public MyToken x;
 ```
-* `contextSuperClass`. Specify the super class of parse tree internal nodes. Default is `ParserRuleContext`. Should derived from ultimately `RuleContext` at minimum.
+* `contextSuperClass`. Specify the super class of parse tree internal nodes. Default is `ParserRuleContext`. Should derive from ultimately `RuleContext` at minimum.
+Java target can use `contextSuperClass=org.antlr.v4.runtime.RuleContextWithAltNum` for convenience. It adds a backing field for `altNumber`, the alt matched for the associated rule node. 
 
 ## Rule Options