Index: manual/editors/graph_editor/introduction.rst
===================================================================
--- manual/editors/graph_editor/introduction.rst	(revision 10120)
+++ manual/editors/graph_editor/introduction.rst	(working copy)
@@ -209,7 +209,10 @@
 
 Normalize
    Normalize curves so the maximum or minimum point equals 1.0 or -1.0.
+   When enabled, the view scales to fit the normalized curves and the outer range is darkened.
 
+   If a preview range is defined, keyframes within the range are normalized, while the rest is scaled proportionally.
+
    Auto
       Automatically recalculate curve normalization on every curve edit.
       This is useful to prevent curves from jumping after tweaking it.