diff --git a/doc/org.texi b/doc/org.texi
index fa051d098..e0769f9b5 100644
--- a/doc/org.texi
+++ b/doc/org.texi
@@ -9460,7 +9460,8 @@ enabled (default in Emacs 23).
 @cindex org-export-with-tasks
 You may use tags to select the parts of a document that should be exported,
 or to exclude parts from export.  This behavior is governed by two variables:
-@code{org-export-select-tags} and @code{org-export-exclude-tags}.
+@code{org-export-select-tags} and @code{org-export-exclude-tags},
+respectively defaulting to @code{'(:export:)} and @code{'(:noexport:)}.
 
 @enumerate
 @item