1 files changed, 8 insertions, 0 deletions
diff --git a/doc/context/sources/general/manuals/lowlevel/lowlevel-inserts.tex b/doc/context/sources/general/manuals/lowlevel/lowlevel-inserts.tex
index 4976ce564..caf3198b9 100644
--- a/doc/context/sources/general/manuals/lowlevel/lowlevel-inserts.tex
+++ b/doc/context/sources/general/manuals/lowlevel/lowlevel-inserts.tex
@@ -193,6 +193,14 @@ processing.
 
 \stopsectionlevel
 
+\startsectionlevel[title=Synchronizing]
+
+The page builder can triggered by (for instance) a penalty but you can also use
+type {\pageboundary}. This will trigger the page builder but not leave anything
+behind. (This is experimental.)
+
+\stopsectionlevel
+
 \startsectionlevel[title=Callbacks]
 
 {\em Todo, nothing new there, so no hurry.}