--- a/tools/features/debug-feature.jam
+++ b/tools/features/debug-feature.jam
@@ -18,7 +18,7 @@
 |# # end::doc[]
 
 feature.feature debug-symbols
-    : on off
+    : on off none
     : propagated ;
 
 #| tag::prof-doc[]
--- a/tools/features/optimization-feature.jam
+++ b/tools/features/optimization-feature.jam
@@ -16,7 +16,7 @@
 |# # end::doc[]
 
 feature.feature optimization
-    : off speed space
+    : off none speed space
     : propagated ;
 
 #| tag::inline-doc[]