Added comments

lib/SugarTrail/Template/Master.pm

     my $self = shift;
     my $args = shift;
 
+    #create an "empty" slave
     my $slave = SugarTrail::Template::Slave->new($args);
 
     my @slave_steps;
 
     STEP: foreach my $master_step (@{ $self->{steps} }) {
-        my $accept = 1;
+        my $accept = 1;     # accept by default
         my $slave_step = {
             line        => $master_step->{line},
             warnings    => []
         };
+        # test against each condition from the pre-parsed condblock
+        # if any number of condition warnings is found, accept
+        # otherwise accept step unless a condition failed
         COND: foreach my $condstr (@{ $master_step->{conds} }) {
             my $c = SugarTrail::Template::Condition->new($condstr);
             my ($r, $w) = $c->match($args);