diff --git a/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/AsciidoctorFormatter.java b/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/AsciidoctorFormatter.java
index 5517fbe..57ba4a8 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/AsciidoctorFormatter.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/AsciidoctorFormatter.java
@@ -17,6 +17,7 @@
 import static com.googlesource.gerrit.plugins.xdocs.XDocGlobalConfig.KEY_INCLUDE_TOC;
 import static java.nio.charset.StandardCharsets.UTF_8;
 
+import com.google.common.base.MoreObjects;
 import com.google.common.io.ByteStreams;
 import com.google.gerrit.common.TimeUtil;
 import com.google.gerrit.extensions.annotations.PluginData;
@@ -51,14 +52,17 @@
   private static final String ERUBY = "erb";
 
   private final File baseDir;
-  private final String css;
+  private final String defaultCss;
   private final Properties attributes;
+  private final FormatterUtil util;
 
   @Inject
-  public AsciidoctorFormatter(@PluginData File baseDir) throws IOException {
+  public AsciidoctorFormatter(@PluginData File baseDir,
+      FormatterUtil formatterUtil) throws IOException {
     this.baseDir = baseDir;
-    this.css = readCss();
+    this.defaultCss = readCss();
     this.attributes = readAttributes();
+    this.util = formatterUtil;
   }
 
   @Override
@@ -74,7 +78,10 @@
       try (FileInputStream input = new FileInputStream(tmpFile)) {
         ByteArrayOutputStream out = new ByteArrayOutputStream();
         ByteStreams.copy(input, out);
-        return insertCss(out.toString(UTF_8.name()));
+        return util.insertCss(
+            out.toString(UTF_8.name()),
+            MoreObjects.firstNonNull(
+                util.getCss(projectName, "asciidoctor"), defaultCss));
       }
     } finally {
       if (!tmpFile.delete()) {
@@ -107,21 +114,6 @@
     return ab.get();
   }
 
-  private String insertCss(String html) {
-    int p = html.lastIndexOf("</head>");
-    if (p > 0) {
-      StringBuilder b = new StringBuilder();
-      b.append(html.substring(0, p));
-      b.append("<style type=\"text/css\">\n");
-      b.append(css);
-      b.append("</style>\n");
-      b.append(html.substring(p));
-      return b.toString();
-    } else {
-      return html;
-    }
-  }
-
   private static String readCss() throws IOException {
     String name = "asciidoctor.css";
     URL url = AsciidoctorFormatter.class.getResource(name);
diff --git a/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/FormatterUtil.java b/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/FormatterUtil.java
new file mode 100644
index 0000000..3fb1d18
--- /dev/null
+++ b/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/FormatterUtil.java
@@ -0,0 +1,131 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.xdocs.formatter;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.apache.commons.lang.StringEscapeUtils.escapeHtml;
+
+import com.google.gerrit.extensions.annotations.PluginName;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.reviewdb.client.RefNames;
+import com.google.gerrit.server.git.GitRepositoryManager;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.ObjectLoader;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.revwalk.RevTree;
+import org.eclipse.jgit.revwalk.RevWalk;
+import org.eclipse.jgit.treewalk.TreeWalk;
+import org.eclipse.jgit.treewalk.filter.PathFilter;
+
+import java.io.IOException;
+
+@Singleton
+public class FormatterUtil {
+  private final GitRepositoryManager repoManager;
+  private final String pluginName;
+
+  @Inject
+  FormatterUtil(@PluginName String pluginName,
+      GitRepositoryManager repoManager) {
+    this.pluginName = pluginName;
+    this.repoManager = repoManager;
+  }
+
+  /**
+   * Returns the CSS from the file "<plugin-name>/<name>.css" in the
+   * refs/meta/config branch of the project.
+   *
+   * @param name the name of the file in the "<plugin-name>/" folder without the
+   *        ".css" file extension
+   * @return the CSS from the file; HTML characters are escaped;
+   *         <code>null</code> if the file doesn't exist
+   */
+  public String getCss(String projectName, String name) {
+    return escapeHtml(getMetaConfigFile(projectName, name + ".css"));
+  }
+
+  /**
+   * Inserts the given CSS into the given HTML.
+   *
+   * @param html the HTML
+   * @param css the CSS
+   * @return the HTML that includes the CSS
+   */
+  public String insertCss(String html, String css) {
+    if (html == null || css == null) {
+      return html;
+    }
+
+    int p = html.lastIndexOf("</head>");
+    if (p > 0) {
+      StringBuilder b = new StringBuilder();
+      b.append(html.substring(0, p));
+      b.append("<style type=\"text/css\">\n");
+      b.append(css);
+      b.append("</style>\n");
+      b.append(html.substring(p));
+      return b.toString();
+    } else {
+      return html;
+    }
+  }
+
+  /**
+   * Returns the content of the specified file from the "<plugin-name>/" folder
+   * of the ref/meta/config branch.
+   *
+   * @param projectName the name of the project
+   * @param fileName the name of the file in the "<plugin-name>/" folder
+   * @return the file content, <code>null</code> if the file doesn't exist
+   */
+  public String getMetaConfigFile(String projectName, String fileName) {
+    try {
+      Repository repo =
+          repoManager.openRepository(new Project.NameKey(projectName));
+      try {
+        RevWalk rw = new RevWalk(repo);
+        try {
+          RevCommit commit = rw.parseCommit(repo.resolve(RefNames.REFS_CONFIG));
+          RevTree tree = commit.getTree();
+          TreeWalk tw = new TreeWalk(repo);
+          try {
+            tw.addTree(tree);
+            tw.setRecursive(true);
+            tw.setFilter(PathFilter.create(pluginName + "/" + fileName));
+            if (!tw.next()) {
+              return null;
+            }
+            ObjectId objectId = tw.getObjectId(0);
+            ObjectLoader loader = repo.open(objectId);
+            byte[] raw = loader.getBytes(Integer.MAX_VALUE);
+            return new String(raw, UTF_8);
+          } finally {
+            tw.release();
+          }
+        } finally {
+          rw.release();
+        }
+      } finally {
+        repo.close();
+      }
+    } catch (IOException e) {
+      return null;
+    }
+  }
+}
diff --git a/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/MarkdownFormatter.java b/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/MarkdownFormatter.java
index 0f2b2f3..e646027 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/MarkdownFormatter.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/MarkdownFormatter.java
@@ -16,39 +16,21 @@
 
 import static com.googlesource.gerrit.plugins.xdocs.XDocGlobalConfig.KEY_ALLOW_HTML;
 import static java.nio.charset.StandardCharsets.UTF_8;
-import static org.apache.commons.lang.StringEscapeUtils.escapeHtml;
 
-import com.google.gerrit.extensions.annotations.PluginName;
-import com.google.gerrit.reviewdb.client.Project;
-import com.google.gerrit.reviewdb.client.RefNames;
-import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.inject.Inject;
 
 import com.googlesource.gerrit.plugins.xdocs.ConfigSection;
 
-import org.eclipse.jgit.lib.ObjectId;
-import org.eclipse.jgit.lib.ObjectLoader;
-import org.eclipse.jgit.lib.Repository;
-import org.eclipse.jgit.revwalk.RevCommit;
-import org.eclipse.jgit.revwalk.RevTree;
-import org.eclipse.jgit.revwalk.RevWalk;
-import org.eclipse.jgit.treewalk.TreeWalk;
-import org.eclipse.jgit.treewalk.filter.PathFilter;
-
-import java.io.IOException;
 import java.io.UnsupportedEncodingException;
 
 public class MarkdownFormatter implements Formatter {
   public final static String NAME = "MARKDOWN";
 
-  private final GitRepositoryManager repoManager;
-  private final String pluginName;
+  private final FormatterUtil util;
 
   @Inject
-  MarkdownFormatter(@PluginName String pluginName,
-      GitRepositoryManager repoManager) {
-    this.pluginName = pluginName;
-    this.repoManager = repoManager;
+  MarkdownFormatter(FormatterUtil formatterUtil) {
+    this.util = formatterUtil;
   }
 
   @Override
@@ -62,43 +44,8 @@
     // if there is no project-specific CSS and f.setCss(null) is invoked
     // com.google.gerrit.server.documentation.MarkdownFormatter applies the
     // default CSS
-    f.setCss(getCss(projectName));
+    f.setCss(util.getCss(projectName, "markdown"));
     byte[] b = f.markdownToDocHtml(raw, UTF_8.name());
     return new String(b, UTF_8);
   }
-
-  private String getCss(String projectName) {
-    try {
-      Repository repo =
-          repoManager.openRepository(new Project.NameKey(projectName));
-      try {
-        RevWalk rw = new RevWalk(repo);
-        try {
-          RevCommit commit = rw.parseCommit(repo.resolve(RefNames.REFS_CONFIG));
-          RevTree tree = commit.getTree();
-          TreeWalk tw = new TreeWalk(repo);
-          try {
-            tw.addTree(tree);
-            tw.setRecursive(true);
-            tw.setFilter(PathFilter.create(pluginName + "/markdown.css"));
-            if (!tw.next()) {
-              return null;
-            }
-            ObjectId objectId = tw.getObjectId(0);
-            ObjectLoader loader = repo.open(objectId);
-            byte[] raw = loader.getBytes(Integer.MAX_VALUE);
-            return escapeHtml(new String(raw, UTF_8));
-          } finally {
-            tw.release();
-          }
-        } finally {
-          rw.release();
-        }
-      } finally {
-        repo.close();
-      }
-    } catch (IOException e) {
-      return null;
-    }
-  }
 }
diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index c18c697..d0b648d 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -61,6 +61,7 @@
 For some formatters a custom CSS file for the rendering can be
 provided in the `refs/meta/config` branch of the project:
 
+* `ASCIIDOCTOR`: `xdoc/asciidoctor.css`
 * `MARKDOWN`: `xdoc/markdown.css`
 
 Custom CSS files are *NOT* inherited from parent projects.