diff --git a/docs/Doxyfile b/docs/Doxyfile
index 2e2e343227..4cb9cc3b37 100644
--- a/docs/Doxyfile
+++ b/docs/Doxyfile
@@ -829,7 +829,7 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = ../src/serializers
+INPUT                  = ../src/serializers ../src/ifcgeom
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses