README.md in rcmd-1.6.2 vs README.md in rcmd-1.6.3

@@ -79,15 +79,20 @@
 node12 :: node12.example.com
 ```
 
 ## Database backend support
 The database backend support is provided by ActiveRecord and thus
-compatible with databases which are supported by ActiveRecord.
-Currently the ActiveRecord version is locked to 4.0.0 in the Gemspec
-due to compatibilty issues with RHEL, CentOS, and Mac OSx to name a
-few.
+compatible with databases which are supported by ActiveRecord. Out of
+the box mysql2, sqlite3 and postgresql work.  To use another database
+backend then you will need to download the source, add it to the
+rcmd.gemspec file, and correct the 'requires' in lib/rcmd/db.rb
+accordingly.
 
+I tried having all of types in there but the dependency requirements
+became too great, both within Ruby and development libraries on the
+system.
+
 To set up the database backend run rcmd with the '-C' switch first.
 This will create a database configuration file in ~/.rcmd named
 dbconfig.yml.  In this file you can specify the adapter, and various
 other soptions for the database backend.  For the queries to work
 properly, the :host_field: *MUST* be set so the command knows what
@@ -141,9 +146,16 @@
 node12 :: node12.example.com
 node18 :: node18.example.com
 node17 :: node17.example.com
 node11 :: node11.example.com
 ```
+## Database Issues
+
+Due to some Operating systems forcing older Ruby versions (RedHat,
+CentOS, Mac OS X) rcmd will not install properly on these hosts. You
+can either manually install a newer version of Ruby (>= 2.2.2) or you
+can try to install activerecord and activesuppert versions 4.2.6.
+This might work but I have not fully tested it as of yet.
 
 # Development
 
 If you are wanting to modify the code by all means do so.  If you clone this repository you can then run `bundle install` to install the dependencies needed.  Tests are performed with *rspec* and can be run with *rake*.