diff --git a/Supporters/lib/Supporters.pm b/Supporters/lib/Supporters.pm
index 004ee9c..a103202 100644
--- a/Supporters/lib/Supporters.pm
+++ b/Supporters/lib/Supporters.pm
@@ -300,7 +300,8 @@ Arguments:
 =item descriptionListRef
 
    A list reference to the list of configuration descriptions to associate
-   with this requestId.
+   with this requestId.  Duplicates aren't permitted in this list, and
+   die()'s if duplicates exist.
 
 =back
 
@@ -323,7 +324,17 @@ sub addRequestConfigurations($$$) {
     unless defined $requestType;
 
   my %descriptions;
-
+  my $sth = $self->dbh->prepare("INSERT INTO request_configuration(request_type_id, description) " .
+                                                           "VALUES(?,               ?)");
+  foreach my $description (@{$descriptionListRef}) {
+    if (defined $descriptions{$description}) {
+      $self->dbh->rollback();
+      die "addRequestConfigurations: attempt to create duplicate request_configuration \"$description\" for requestType, \"$requestType\"";
+    }
+    $sth->execute($requestId, $description);
+    $descriptions{$description} = $self->dbh->last_insert_id("","","","");
+  }
+  $sth->finish();
   $self->dbh->commit();
   return { $requestId => \%descriptions };
 }
diff --git a/Supporters/t/Supporters.t b/Supporters/t/Supporters.t
index 7410d6c..69c0c20 100644
--- a/Supporters/t/Supporters.t
+++ b/Supporters/t/Supporters.t
@@ -5,7 +5,7 @@
 use strict;
 use warnings;
 
-use Test::More tests => 38;
+use Test::More tests => 49;
 use Test::Exception;
 
 use Scalar::Util qw(looks_like_number);
@@ -176,13 +176,13 @@ my @sizeList = qw/LadiesS LadiesM LadiesL LadiesXL MenS MenM MenL MenXL Men2XL/;
 
 my $tShirt0Data;
 
-lives_ok { $tShirt0Data = $sp->addRequestConfigurations('t-shirt-0') }
+lives_ok { $tShirt0Data = $sp->addRequestConfigurations('t-shirt-0', \@sizeList) }
   "addRequestConfigurations: existing requestType with configuration runs.";
 
 is( keys %{$tShirt0Data}, ($tShirt0RequestTypeId),
     "addRequestConfigurations: reuses same requestTypeId on add of configurations");
 
-my $cnt;
+my $cnt = 0;
 foreach my $size (@sizeList) {
   ok( (defined $tShirt0Data->{$tShirt0RequestTypeId}{$size} and
        looks_like_number($tShirt0Data->{$tShirt0RequestTypeId}{$size}) and
diff --git a/sql/supporters-schema.sql b/sql/supporters-schema.sql
index 0a112e2..c93602e 100644
--- a/sql/supporters-schema.sql
+++ b/sql/supporters-schema.sql
@@ -29,6 +29,9 @@ CREATE TABLE "request_configuration" (
     "description"   varchar(100) NOT NULL
     );
 
+CREATE UNIQUE INDEX request_configuration__single_description
+   ON request_configuration(request_type_id, description);
+
 DROP TABLE IF EXISTS "fulfillment";
 
 CREATE TABLE "fulfillment" (