diff --git a/source/sec-Set-Theory.ptx b/source/sec-Set-Theory.ptx
index e472641..f0e3be5 100644
--- a/source/sec-Set-Theory.ptx
+++ b/source/sec-Set-Theory.ptx
@@ -140,7 +140,7 @@
         </latex-image>
       </image>
     </figure>
-    <!-- TODO learn figures -->
+
     <definition xml:id="def-disjoint">
       <statement>
         <p>