add legal files
diff --git a/contrib/org.eclipse.objectteams.jdt.nullity/build.properties b/contrib/org.eclipse.objectteams.jdt.nullity/build.properties
index e9863e2..7e12a2c 100644
--- a/contrib/org.eclipse.objectteams.jdt.nullity/build.properties
+++ b/contrib/org.eclipse.objectteams.jdt.nullity/build.properties
@@ -2,4 +2,6 @@
 output.. = bin/
 bin.includes = META-INF/,\
                .,\
-               plugin.xml
+               plugin.xml,\
+               about.ini,\
+               about.html