diff --git a/doc/Doxyfile b/doc/Doxyfile
index 363efd0f..54693ee8 100644
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@@ -590,7 +590,7 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories 
 # with spaces.
 
-INPUT                  = include/mitsuba/core include/mitsuba/render doc/doxyfiles
+INPUT                  = include/mitsuba/core include/mitsuba/render include/mitsuba/hw include/mitsuba/bidir doc/doxyfiles
 
 # This tag can be used to specify the character encoding of the source files 
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding, which is 
diff --git a/include/mitsuba/render/gatherproc.h b/include/mitsuba/render/gatherproc.h
index 0bd5196c..45d96ca3 100644
--- a/include/mitsuba/render/gatherproc.h
+++ b/include/mitsuba/render/gatherproc.h
@@ -25,7 +25,7 @@
 MTS_NAMESPACE_BEGIN
 
 /**
- * Process for parallel photon map construction
+ * \brief Process for parallel photon map construction
  *
  * Given a number and type (surface/caustic/volume) of photons, this 
  * class distributes the work over an arbitrary number of machines.