diff --git a/Documentation/blame-options.txt b/Documentation/blame-options.txt
index 624b3532a2..4e55b1564e 100644
--- a/Documentation/blame-options.txt
+++ b/Documentation/blame-options.txt
@@ -11,8 +11,11 @@
 
 -L <start>,<end>::
 -L :<regex>::
-	Annotate only the given line range.  <start> and <end> can take
-	one of these forms:
+	Annotate only the given line range.  <start> and <end> are optional.
+	``-L <start>'' or ``-L <start>,'' spans from <start> to end of file.
+	``-L ,<end>'' spans from start of file to <end>.
++
+<start> and <end> can take one of these forms:
 
 include::line-range-format.txt[]