diff --git a/lib/bookie/book.rb b/lib/bookie/book.rb
index 53ef59d..68ea904 100644
--- a/lib/bookie/book.rb
+++ b/lib/bookie/book.rb
@@ -14,7 +14,11 @@ def chapter(name, file)
     # FIXME: This is inefficient, it should be possible to fire up the parser
     # just once with many emitters.
     def render(basename, emitters)
+      emitters = *emitters
+
       emitters.each do |emitter|
+        emitter = emitter.new if emitter.is_a? Class
+
         chapters.each_with_index do |(name, file), i|
           emitter.start_new_chapter(header: "Chapter #{i+1}",
                                     title:  name)
diff --git a/lib/bookie/emitters/html.rb b/lib/bookie/emitters/html.rb
index 11dcf71..c08f10b 100644
--- a/lib/bookie/emitters/html.rb
+++ b/lib/bookie/emitters/html.rb
@@ -38,6 +38,10 @@ def build_section_heading(header)
         @body << "<h2>#{header.contents}</h2>"
       end
 
+      def build_sub_section_heading(header)
+        @body << "<h3>#{header.contents}</h3>"
+      end
+
       def build_list(list)
         list_elements = list.contents.map { |li| "<li>#{li}</li>" }.join
         @body << "<ul>"+list_elements+"</ul>"
diff --git a/lib/bookie/emitters/null.rb b/lib/bookie/emitters/null.rb
index 1f88e47..32dc060 100644
--- a/lib/bookie/emitters/null.rb
+++ b/lib/bookie/emitters/null.rb
@@ -10,6 +10,9 @@ def build_raw_text(raw_text)
       def build_section_heading(header)
       end
 
+      def build_sub_section_heading(header)
+      end
+
       def build_list(content)
       end
     end
diff --git a/lib/bookie/emitters/pdf.rb b/lib/bookie/emitters/pdf.rb
index 8578c92..45da4ad 100644
--- a/lib/bookie/emitters/pdf.rb
+++ b/lib/bookie/emitters/pdf.rb
@@ -66,6 +66,22 @@ def build_section_heading(section_text)
         end
       end
 
+      def build_sub_section_heading(section_text)
+        draw do
+          start_new_page unless cursor > in2pt(0.4)
+
+          move_down in2pt(0.1)
+
+          float do
+            font("sans", :style => :bold, :size => 10) do
+              text(section_text.contents.strip)
+            end
+          end
+
+          move_down in2pt(0.3)
+        end
+      end
+
       def build_paragraph(paragraph)
         para_text = convert_inlines(paragraph.contents)
 
diff --git a/lib/bookie/parser.rb b/lib/bookie/parser.rb
index a1506c8..e58ac9c 100644
--- a/lib/bookie/parser.rb
+++ b/lib/bookie/parser.rb
@@ -1,10 +1,11 @@
 module Bookie
-  Paragraph        = Struct.new(:contents)
-  RawText          = Struct.new(:contents)
-  SectionHeading   = Struct.new(:contents)
-  List             = Struct.new(:contents)
-  NormalText       = Struct.new(:contents)
-  CodeText         = Struct.new(:contents)
+  Paragraph         = Struct.new(:contents)
+  RawText           = Struct.new(:contents)
+  SectionHeading    = Struct.new(:contents)
+  SubSectionHeading = Struct.new(:contents)
+  List              = Struct.new(:contents)
+  NormalText        = Struct.new(:contents)
+  CodeText          = Struct.new(:contents)
   
   class Parser
     def self.parse(raw_data, emitter=Bookie::Emitters::Null.new)
@@ -56,6 +57,12 @@ def extract_section_heading(contents)
       parsed_content << header
     end
 
+    def extract_sub_section_heading(contents)
+      header = SubSectionHeading.new(contents.chomp)
+      @emitter.build_sub_section_heading(header)
+      parsed_content << header
+    end
+
     def extract_list(contents)
       list = List.new(contents.map { |e| e.chomp })
       @emitter.build_list(list)
@@ -75,6 +82,8 @@ def parse_contents(raw_data)
           case line
           when /^## /
             extract_section_heading(line[3..-1])
+          when /^### /
+            extract_sub_section_heading(line[4..-1])
           when /^ {4,}/
             mode = :raw 
             chunk = line[4..-1]