adding extra comments

puppet/modules/gdal-ras/manifests/init.pp

 class gdal-ras {
 
+# this VM serves for re-building of Rasdaman-enabled gdal 
+# RPM packages 
+
 	Package {
 		require => [
 			Augeas['enable_eox-testing'], 

puppet/modules/gdal-shibboleth/manifests/init.pp

 class gdal-shibboleth {
+
+# this VM serves for re-building of Shibboleth-friendly 
+# Rasdaman-enabled gdal RPM packages 
+
 	Package {
 		require => [
 			Yumrepo['security:shibboleth'],

puppet/modules/gdal/manifests/init.pp

 class gdal {
 
+# this VM serves for re-building of the CentOS baseline 
+# gdal RPM packages
+
 	package { 'ant': ensure => 'latest' }
 #	package { 'atlas-devel': ensure => 'latest' }
 	package { 'cfitsio-devel': ensure => 'latest' }