diff --git a/Documentation/git-blame.txt b/Documentation/git-blame.txt
index 7ee9236..e44173f 100644
--- a/Documentation/git-blame.txt
+++ b/Documentation/git-blame.txt
@@ -20,6 +20,12 @@
 
 The command can also limit the range of lines annotated.
 
+The origin of lines is automatically followed across whole-file
+renames (currently there is no option to turn the rename-following
+off). To follow lines moved from one file to another, or to follow
+lines that were copied and pasted from another file, etc., see the
+`-C` and `-M` options.
+
 The report does not tell you anything about lines which have been deleted or
 replaced; you need to use a tool such as 'git diff' or the "pickaxe"
 interface briefly mentioned in the following paragraph.