diff --git a/templates/invoice.tex.erb b/templates/invoice.tex.erb
index 38f6fb4..f6befaf 100644
--- a/templates/invoice.tex.erb
+++ b/templates/invoice.tex.erb
@@ -88,6 +88,13 @@
 \newcommand{\ihtotal}[1]{\cmidrule[.05em]{4-4}%
   \textbf{\totaltext}&&&\textbf{\currency~#1}}
 
+\newenvironment{istable}%
+ {\vskip1em\tabularx{\linewidth}{@{}X@{\quad}l@{\qquad}r@{}}
+   \descriptiontext&Datum&Aantal uur\ML}%
+ {\endtabularx}
+\newcommand{\istask}[1]{\textbf{#1}\\}
+\newcommand{\isitem}[3]{\quad #1&#2&#3\\}
+
 \begin{document}
 
 \invoice{
@@ -128,4 +135,26 @@
  \accountdata
 }
 
+<% if @invoice.include_specification? %>{
+ \newpage
+
+ {\bfseries\scshape\Large Specificatie}
+
+ Hieronder volgt een specificatie van gemaakte uren per taak per
+ uitgevoerde activiteit.
+
+ \begin{istable}
+ <% @invoice.tasks.each do |task|
+%> \istask{<%= task.comment_or_name %>}<%
+      task.time_entries.each do |time_entry| %>
+  \isitem{<%= time_entry.comment || "Geen opmerking" %>}%
+         {<%= time_entry.date.to_date %>}%
+         {<%= number_with_precision(time_entry.hours_total) %>}<%
+      end %>\\[\medskipamount]<%
+    end %>
+ \end{istable}
+ \label{LastPageOf\thelettercount}
+<% end %>}
+\letter{}
+
 \end{document}