diff --git a/lib/repubmark/elems/joint.rb b/lib/repubmark/elems/joint.rb
index 5b11672..b48b463 100644
--- a/lib/repubmark/elems/joint.rb
+++ b/lib/repubmark/elems/joint.rb
@@ -100,10 +100,10 @@ module Repubmark
       # Builder methods: Notes #
       ##########################
 
-      def context(index, anchor)
+      def context(index, category, slug)
         raise 'Context already given' if @context
 
-        @context = [index, anchor]
+        @context = [index, category, slug]
         nil
       end
 
@@ -115,8 +115,8 @@ module Repubmark
         ref_note(*@context)
       end
 
-      def ref_note(index, anchor)
-        note Note.new self, index, anchor
+      def ref_note(index, category, slug)
+        note Note.new self, index, category, slug
       end
 
     private
diff --git a/lib/repubmark/elems/note.rb b/lib/repubmark/elems/note.rb
index 1f4ef45..cb08247 100644
--- a/lib/repubmark/elems/note.rb
+++ b/lib/repubmark/elems/note.rb
@@ -5,10 +5,11 @@ module Repubmark
     class Note < Base
       parents :Joint
 
-      def initialize(parent, index, anchor)
+      def initialize(parent, index, category, slug)
         super parent
         @index = index
-        @anchor = anchor
+        @category = category
+        @slug = slug
       end
 
       #################
@@ -18,7 +19,7 @@ module Repubmark
       def to_html
         [
           '<sup>',
-          %(<a href="##{CGI.escape_html(@anchor)}">),
+          %(<a href="##{CGI.escape_html(anchor)}">),
           %([#{CGI.escape_html(@index.to_s)}]),
           '</a>',
           '</sup>',
@@ -29,6 +30,8 @@ module Repubmark
 
     private
 
+      def anchor = "#@category-#@slug"
+
       def index_unicode_sup
         @index_unicode_sup ||= Repubmark.unicode_sup @index
       end