diff --git a/vlsisapd/doc/dtr/Exception.dox b/vlsisapd/doc/dtr/Exception.dox
new file mode 100644
index 00000000..9b2505ee
--- /dev/null
+++ b/vlsisapd/doc/dtr/Exception.dox
@@ -0,0 +1,9 @@
+// -*- C++ -*-
+
+namespace DTR {
+/*! \class DTRException
+ *
+ *  This class describes the exceptions throwed by the DTR library in case of errors.
+ */
+
+}
diff --git a/vlsisapd/doc/dtr/dtr.dox b/vlsisapd/doc/dtr/dtr.dox
index f81eafe6..c031b326 100644
--- a/vlsisapd/doc/dtr/dtr.dox
+++ b/vlsisapd/doc/dtr/dtr.dox
@@ -15,6 +15,8 @@
   - DTR::Rule & DTR::ARule respectively describe a symmetrical and an asymmetrical rule.
   - DTR::Name provides an automatic management of shared name.
 
+  The library also use the DTR::DTRException class to throw excptions.
+
   \subsection dtrParser Using the parser
   Simply load a technology with static function DTR::Techno::readFromFile() and then get rules (DTR::Techno::getRule()) or directly values (DTR::Techno::getValue()).