add comment to Element

[sbp.git] / src / edu / berkeley / sbp / Element.java

diff --git a/src/edu/berkeley/sbp/Element.java b/src/edu/berkeley/sbp/Element.java
index 3622aea..35678ab 100644 (file)
--- a/src/edu/berkeley/sbp/Element.java
+++ b/src/edu/berkeley/sbp/Element.java
@@ -15,6 +15,7 @@ public abstract class Element implements SequenceOrElement {
     /** sorry, you can't make up new, custom elements */
     Element() { }
 
+    /** a more verbose version of toString() which should show the entire grammar */
     abstract StringBuffer toString(StringBuffer sb);
 
     /** returns the Forest resulting from matching this element against the empty string */