Update README.md

README.md

@@ -3,15 +3,28 @@ gtfs-validator
 
 A Java framework for GTFS validation and statistics.
 
-[![Build Status](https://travis-ci.org/laidig/gtfs-validator.svg?branch=master)](https://travis-ci.org/laidig/gtfs-validator) [![Coverage Status](https://coveralls.io/repos/github/laidig/gtfs-validator/badge.svg?branch=master)](https://coveralls.io/github/laidig/gtfs-validator?branch=master)
+[![Build Status](https://travis-ci.org/laidig/gtfs-validator.svg?branch=master)](https://travis-ci.org/laidig/gtfs-validator) 
+
+How is this different than the Google-supported validator?
+=============
+The Google TransitFeed-based [validator](https://github.com/google/transitfeed/blob/master/feedvalidator.py) is written in Python, and is quite slow on large feeds. I also find the code rather hard to understand. While it supports extensions, few have extended it.
+
+This validator uses the [Onebusaway-GTFS](https://github.com/OneBusAway/onebusaway-gtfs-modules) library, written in Java and is far faster at processing large feeds. 
+
+How is this different than Conveyal's branch?
+=============
+This project originated at Conveyal. This fork includes a number of updates and improvements, namely:
+* Requiring Java 8
+* Updated dependencies to currently supported versions
+* Minor bug fixes and light refactoring
+* More testing
+* Continuous Integration via Travis, and
+* A number of additional validations
 
 Using this framework
 ==============
-Check out this repository and import using Maven.
-
 There are then multiple options for use:
 
-
 1. Use the JAR provided in the releases. `java -jar gtfs-validator.jar yourGtfs.zip`
 
 2. Import the services provided and build your own validation.
@@ -21,7 +34,7 @@ There are then multiple options for use:
 ==============
 ValidatorMain
 
-The ValidatorMain class logs a number of common GTFS errors to Standard Out on the console. This includes:
+The ValidatorMain class logs a number of common GTFS errors to Standard Out on the console when run as a JAR. This includes:
 
  * Problems with route names
  * Bad shape coordinates
@@ -30,7 +43,7 @@ The ValidatorMain class logs a number of common GTFS errors to Standard Out on t
  * Missing stop coordinates
  * Missing stop times for trips
  * Stop times out of sequence
- * Duplicated trips in trips.txt
+ * Duplicated trips (same times)
  * Overlapping trips when block_id is present
  * Missing shapes and shape coordinates
  * “Reversed” shapes with directions that do not agree with stop times.