Missing <co>

Sd1/swd1.xml

@@ -2468,8 +2468,9 @@ for (...) {
 
               <para>We may then modify our loop to exclude lobster coordinate
               positions <coref linkend="sd1ListingExcludeLobsterCircle"/>
-              falling inside a circle of radius minimalLobsterCrabDistance
-              surrounding our crab:</para>
+              falling inside a circle of radius <emphasis
+              role="bold">minimalLobsterCrabDistance</emphasis> surrounding
+              our crab:</para>
 
               <programlisting>  public void populateWorld() {
     
@@ -2495,7 +2496,8 @@ for (...) {
       // We only add a lobster at coordinate position (lobsterX|lobsterY) if
       // its distance to our crab is sufficiently large.
       //
-      if (<emphasis role="bold">minimalLobsterCrabDistance * minimalLobsterCrabDistance &lt;</emphasis>   // Distance between lobster and crab is
+      if (<emphasis role="bold">minimalLobsterCrabDistance * minimalLobsterCrabDistance &lt;</emphasis>  <co
+                  xml:id="sd1ListingExcludeLobsterCircle"/> // Distance between lobster and crab is
           <emphasis role="bold">deltaX * deltaX + deltaY * deltaY</emphasis>) {                        // larger than minimalLobsterCrabDistance.
         addObject(new Lobster(getRandomRotation()), lobsterX, lobsterY);
         numLobsters++;