README.md in armg-0.5.2 vs README.md in armg-0.6.0

- old
+ new

@@ -75,11 +75,11 @@
 
 Geom.take
 #=> #<Geom id: 1, location: #<RGeo::Geographic::SphericalPointImpl:0x... "POINT (-122.1 47.3)">>
 ```
 
-## Using custom WKB serializer
+## Using custom serializer
 
 ```ruby
 class CustomSerializer
   def initialize
     @wkt_parser = RGeo::WKRep::WKTParser.new(nil, support_ewkt: true)
@@ -110,5 +110,10 @@
 bundle exec appraisal ar51 rake
 # bundle exec appraisal ar50 rake
 # ARMG_TEST_MYSQL_PORT=10057 bundle exec appraisal ar51 rake # MySQL 5.7
 # ARMG_TEST_MYSQL_PORT=10057 ARMG_TEST_MYSQL_ENGINE=InnoDB bundle exec appraisal ar51 rake
 ```
+
+## Related links
+
+* [rgeo/rgeo: Geospatial data library for Ruby](https://github.com/rgeo/rgeo)
+* [MySQL :: MySQL 5.7 Reference Manual :: 11.5.3 Supported Spatial Data Formats](https://dev.mysql.com/doc/refman/5.7/en/gis-data-formats.html)