diff --git a/README.md b/README.md
index d57ea27..c9eb069 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,7 @@ class MyApp < Sinatra::Base
   notes 'Simple route that gets an ID and returns a string'
   produces 'text/plain'
   status_codes [200]
+  parameter :id, description: 'some ID'
   get '/:id' do |id|
     "Received #{id}"
   end
diff --git a/etc/css/base.css b/etc/css/base.css
index 546069a..15610a8 100644
--- a/etc/css/base.css
+++ b/etc/css/base.css
@@ -283,3 +283,20 @@ article.example
   color:#555;
   margin:1em;
 }
+
+.required_parameter
+{
+  color:#a41e22;
+  font-size:0.7em;
+}
+
+.parameter_type
+{
+  font-size:0.8em;
+  font-weight:400;
+}
+
+.parameter_in
+{
+  color:#555;
+}
\ No newline at end of file
diff --git a/etc/partial.html.erb b/etc/partial.html.erb
index 9d98fcd..bd0bed7 100644
--- a/etc/partial.html.erb
+++ b/etc/partial.html.erb
@@ -48,12 +48,25 @@
                     <thead>
                       <tr>
                         <th>Parameter</th>
+                        <th>Description</th>
                       </tr>
                     </thead>
                     <tbody class="operation-params">
-                    <% route[:parameters].each do |param| %>
+                    <% route[:parameters].each do |param_name, param_options| %>
                       <tr>
-                        <td><%= param %></td>
+                        <td>
+                          <%= param_name %>
+                          <% if param_options[:required] %>
+                            <sup class="required_parameter">*required</sup>
+                          <% end %>
+                          <% if param_options[:type] %>
+                            <div class="parameter_type"><%= param_options[:type] %></div>
+                          <% end %>
+                          <% if param_options[:in] %>
+                            <div class="parameter_in">(<%= param_options[:in] %>)</div>
+                          <% end %>
+                        </td>
+                        <td><%= param_options[:description] %></td>
                       </tr>
                     <% end %>
                     </tbody>
diff --git a/lib/doc_my_routes/doc/hash_helpers.rb b/lib/doc_my_routes/doc/hash_helpers.rb
new file mode 100644
index 0000000..8163701
--- /dev/null
+++ b/lib/doc_my_routes/doc/hash_helpers.rb
@@ -0,0 +1,13 @@
+# Define error classes
+module DocMyRoutes
+  module HashHelpers
+    def deep_merge(first, second)
+      merger = proc { |key, f, s| f.is_a?(Hash) && s.is_a?(Hash) ? f.merge(s, &merger) : s }
+      first.merge(second, &merger)
+    end
+
+    def array_to_hash_keys(arr, default_value = {})
+      {}.tap { |hash| arr.each { |key| hash[key] = default_value } }
+    end
+  end
+end
diff --git a/lib/doc_my_routes/doc/mixins/annotatable.rb b/lib/doc_my_routes/doc/mixins/annotatable.rb
index 299e02a..e77dc75 100644
--- a/lib/doc_my_routes/doc/mixins/annotatable.rb
+++ b/lib/doc_my_routes/doc/mixins/annotatable.rb
@@ -87,6 +87,10 @@ def notes_ref(value)
       route_documentation.notes_ref = value
     end
 
+    def parameter(value, options = {})
+      route_documentation.add_parameter(value, options)
+    end
+
     private
 
     def track_route(resource, verb, route_pattern, conditions)
diff --git a/lib/doc_my_routes/doc/route.rb b/lib/doc_my_routes/doc/route.rb
index c2c48df..ac996b4 100644
--- a/lib/doc_my_routes/doc/route.rb
+++ b/lib/doc_my_routes/doc/route.rb
@@ -1,6 +1,7 @@
 # encoding: utf-8
 
 require 'forwardable'
+require_relative 'hash_helpers'
 
 module DocMyRoutes
   # Simple object representing a route
@@ -23,11 +24,11 @@ def initialize(resource, verb, route_pattern, conditions, documentation)
     end
 
     def to_hash
-      {
+      deep_merge({
         http_method: verb,
         parameters: param_info,
         path: path
-      }.merge(documentation.to_hash)
+      }, documentation.to_hash)
     end
 
     def path
@@ -60,13 +61,15 @@ def to_s
     #
     # Try to extract parameters from the route definition otherwise
     def param_info
-      if conditions[:parameters]
-        conditions[:parameters]
-      else
-        route_pattern.split('/').map do |part|
-          part.start_with?(':') ? part[1..-1].to_sym : nil
-        end.compact
-      end
+      path_parameters_array = route_pattern.split('/').map do |part|
+        part.start_with?(':') ? part[1..-1].to_sym : nil
+      end.compact
+
+      path_parameters = HashHelpers.array_to_hash_keys(path_parameters_array,
+                                                       { in: :path, required: true })
+      condition_parameters = HashHelpers.array_to_hash_keys(conditions[:parameters] || [])
+
+      HashHelpers.deep_merge(condition_parameters, path_parameters)
     end
   end
 end
diff --git a/lib/doc_my_routes/doc/route_documentation.rb b/lib/doc_my_routes/doc/route_documentation.rb
index efc084c..f5aadb5 100644
--- a/lib/doc_my_routes/doc/route_documentation.rb
+++ b/lib/doc_my_routes/doc/route_documentation.rb
@@ -3,12 +3,13 @@ module DocMyRoutes
   class RouteDocumentation
     attr_accessor :summary, :notes, :status_codes, :examples_regex, :hidden,
                   :produces, :notes_ref
-    attr_reader :examples
+    attr_reader :examples, :parameters
 
     def initialize
       @status_codes = { 200 => DocMyRoutes::StatusCodeInfo::STATUS_CODES[200] }
       @hidden = false
       @produces = []
+      @parameters = {}
     end
 
     # A route documentation object MUST have a summary, otherwise is not
@@ -25,6 +26,7 @@ def to_hash
         examples_regex: examples_regex,
         produces: produces,
         examples: examples,
+        parameters: parameters,
         hidden: hidden?
       }
     end
@@ -33,6 +35,10 @@ def produces=(values)
       @produces = values.flatten.compact
     end
 
+    def add_parameter(name, options)
+      @parameters[name] = options
+    end
+
     def status_codes=(route_status_codes)
       @status_codes = Hash[route_status_codes.map do |code|
         [code, DocMyRoutes::StatusCodeInfo::STATUS_CODES[code]]
diff --git a/lib/doc_my_routes/version.rb b/lib/doc_my_routes/version.rb
index 261c05b..f283fbe 100644
--- a/lib/doc_my_routes/version.rb
+++ b/lib/doc_my_routes/version.rb
@@ -1,4 +1,4 @@
 # DocMyRoutes version
 module DocMyRoutes
-  VERSION = '0.11.1'
+  VERSION = '0.12.0'
 end
diff --git a/spec/unit/doc_helpers_spec.rb b/spec/unit/doc_helpers_spec.rb
index 0c664e5..f00d1b2 100644
--- a/spec/unit/doc_helpers_spec.rb
+++ b/spec/unit/doc_helpers_spec.rb
@@ -11,6 +11,7 @@
   DEFAULT_NOTES = 'Example notes'
   DEFAULT_NOTES_FILE = 'etc/example_notes.txt'
   DEFAULT_STATUS_CODES = [200, 401]
+  DEFAULT_PARAMETER_OPTIONS = { type: :integer, description: 'example parameter' }
 
   def mock_notes_file(content, path = 'notes.txt')
     mock_notes_path = File.expand_path(path)
@@ -25,6 +26,7 @@ def mock_notes_file(content, path = 'notes.txt')
     doc.summary = DEFAULT_SUMMARY
     doc.notes = DEFAULT_NOTES
     doc.status_codes = DEFAULT_STATUS_CODES
+    doc.add_parameter(:example_id, DEFAULT_PARAMETER_OPTIONS)
     doc
   end
 
@@ -34,9 +36,7 @@ def mock_notes_file(content, path = 'notes.txt')
                         "Actual object #{actual} doesn't have documentation"
 
       actual_docs = actual.documentation
-      actual_docs.summary == expected.summary && \
-        actual_docs.notes == expected.notes && \
-        actual_docs.status_codes == expected.status_codes
+      actual_docs.to_hash == expected.to_hash
     end
     description { "The route #{actual} doesn't match #{expected}" }
   end
@@ -63,7 +63,7 @@ def mock_notes_file(content, path = 'notes.txt')
     DocMyRoutes::RouteCollection.routes.clear
   end
 
-  context 'with summary, notes and status codes for a GET verb' do
+  context 'with summary, notes, parameter and status codes for a GET verb' do
     subject do
       key = DocMyRoutes::RouteCollection.routes.keys[0]
       DocMyRoutes::RouteCollection.routes[key]
@@ -75,13 +75,16 @@ def doc_route
         summary DEFAULT_SUMMARY
         notes DEFAULT_NOTES
         status_codes DEFAULT_STATUS_CODES
+        parameter :example_id, DEFAULT_PARAMETER_OPTIONS
         get '/api/example' do
         end
       }
     end
+
+    it_behaves_like 'a correctly tracked route'
   end
 
-  context 'with a summary, notes in an external file and status codes' do
+  context 'with a summary, notes in an external file, parameter and status codes' do
     def doc_route
       mock_notes_file(DEFAULT_NOTES, DEFAULT_NOTES_FILE)
       # Test class with only two routes GET and HEAD
@@ -89,6 +92,7 @@ def doc_route
         summary DEFAULT_SUMMARY
         notes_ref DEFAULT_NOTES_FILE
         status_codes DEFAULT_STATUS_CODES
+        parameter :example_id, DEFAULT_PARAMETER_OPTIONS
         post '/api/example_notes_file' do
         end
       }