Index: wp-content/themes/twentyeleven/tag.php
===================================================================
--- wp-content/themes/twentyeleven/tag.php	(revision 17932)
+++ wp-content/themes/twentyeleven/tag.php	(working copy)
@@ -18,6 +18,12 @@
 					<h1 class="page-title"><?php
 						printf( __( 'Tag Archives: %s', 'twentyeleven' ), '<span>' . single_tag_title( '', false ) . '</span>' );
 					?></h1>
+
+					<?php
+						$tag_description = tag_description();
+						if ( ! empty( $tag_description ) )
+							echo apply_filters( 'tag_archive_meta', '<div class="tag-archive-meta">' . $tag_description . '</div>' );
+					?>
 				</header>
 
 				<?php rewind_posts(); ?>
@@ -43,4 +49,4 @@
 		</section><!-- #primary -->
 
 <?php get_sidebar(); ?>
-<?php get_footer(); ?>
\ No newline at end of file
+<?php get_footer(); ?>
Index: wp-content/themes/twentyeleven/category.php
===================================================================
--- wp-content/themes/twentyeleven/category.php	(revision 17932)
+++ wp-content/themes/twentyeleven/category.php	(working copy)
@@ -17,7 +17,11 @@
 						printf( __( 'Category Archives: %s', 'twentyeleven' ), '<span>' . single_cat_title( '', false ) . '</span>' );
 					?></h1>
 
-					<?php $categorydesc = category_description(); if ( ! empty( $categorydesc ) ) echo apply_filters( 'archive_meta', '<div class="archive-meta">' . $categorydesc . '</div>' ); ?>
+					<?php
+						$category_description = category_description();
+						if ( ! empty( $category_description ) )
+							echo apply_filters( 'category_archive_meta', '<div class="category-archive-meta">' . $category_description . '</div>' );
+					?>
 				</header>
 
 				<?php twentyeleven_content_nav( 'nav-above' ); ?>
@@ -41,4 +45,4 @@
 		</section><!-- #primary -->
 
 <?php get_sidebar(); ?>
-<?php get_footer(); ?>
\ No newline at end of file
+<?php get_footer(); ?>