diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/HtmlDiffFormatter.java b/gitiles-servlet/src/main/java/com/google/gitiles/HtmlDiffFormatter.java
index 63b1eb8..993197d 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/HtmlDiffFormatter.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/HtmlDiffFormatter.java
@@ -122,6 +122,7 @@
         out.write(LINE_CHANGE_BEGIN);
         break;
     }
+    out.write(prefix);
     out.write(StringEscapeUtils.escapeHtml4(text.getString(cur)).getBytes(Charsets.UTF_8));
     out.write(LINE_END);
   }
diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/RepositoryDescription.java b/gitiles-servlet/src/main/java/com/google/gitiles/RepositoryDescription.java
index 06ee4da..3942393 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/RepositoryDescription.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/RepositoryDescription.java
@@ -21,5 +21,6 @@
   public String name;
   public String cloneUrl;
   public String description;
+  public String mirroredFromUrl;
   public Map<String, String> branches;
 }
diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/RepositoryIndexServlet.java b/gitiles-servlet/src/main/java/com/google/gitiles/RepositoryIndexServlet.java
index 6659718..11f0e9e 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/RepositoryIndexServlet.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/RepositoryIndexServlet.java
@@ -69,6 +69,7 @@
       walk.release();
     }
     return ImmutableMap.of("cloneUrl", desc.cloneUrl,
+        "mirroredFromUrl", Strings.nullToEmpty(desc.mirroredFromUrl),
         "description", Strings.nullToEmpty(desc.description),
         "branches", getRefs(req, Constants.R_HEADS, Ordering.from(RefComparator.INSTANCE)),
         "tags", tags);
diff --git a/gitiles-servlet/src/main/resources/com/google/gitiles/static/gitiles.css b/gitiles-servlet/src/main/resources/com/google/gitiles/static/gitiles.css
index 851e9bf..1cb3415 100644
--- a/gitiles-servlet/src/main/resources/com/google/gitiles/static/gitiles.css
+++ b/gitiles-servlet/src/main/resources/com/google/gitiles/static/gitiles.css
@@ -120,6 +120,11 @@
   border-bottom: #ddd solid 1px; /* BORDER */
   padding-bottom: 5px; /* VPADDING */
 }
+.repository-mirrored-from {
+  font-size: 85%;
+  font-style: italic;
+  padding-left: 1em;
+}
 .repository-refs {
   width: 650px;
 }
diff --git a/gitiles-servlet/src/main/resources/com/google/gitiles/templates/RepositoryIndex.soy b/gitiles-servlet/src/main/resources/com/google/gitiles/templates/RepositoryIndex.soy
index 02bb4da..cf4173c 100644
--- a/gitiles-servlet/src/main/resources/com/google/gitiles/templates/RepositoryIndex.soy
+++ b/gitiles-servlet/src/main/resources/com/google/gitiles/templates/RepositoryIndex.soy
@@ -21,6 +21,7 @@
  * @param breadcrumbs breadcrumbs for this page.
  * @param cloneUrl clone URL for this repository.
  * @param description description text of the repository.
+ * @param? mirroredFromUrl URL this repository is mirrored from.
  * @param? branches list of branch objects with url and name keys.
  * @param? tags list of tag objects with url and name keys.
  */
@@ -32,8 +33,17 @@
   {param breadcrumbs: $breadcrumbs /}
 {/call}
 
-{if $description}
-  <div class="repository-description">{$description}</div>
+{if $description or $mirroredFromUrl}
+  <div class="repository-description">
+  {$description}
+  {if $mirroredFromUrl}
+    <div class="repository-mirrored-from">
+    {msg desc="Informational text describing source of repository"}
+    (mirrored from <a href="{$mirroredFromUrl}">{$mirroredFromUrl}</a>)
+    {/msg}
+    </div>
+  {/if}
+  </div>
 {/if}
 
 <textarea rows="1" cols="150" class="clone-line"