diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index a5f6148..5759760 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -2209,6 +2209,16 @@
 	Specifies whether to use quickfix window to show cscope results.
 	See |cscopequickfix|.
 
+						*'cscoperelative'* *'csre'*
+'cscoperelative' 'csre' boolean (default off)
+			global
+			{not available when compiled without the |+cscope|
+			feature}
+			{not in Vi}
+	In the absence of a prefix (-P) for cscope. setting this option enables
+	to use the basename of cscope.out path as the prefix.
+	See |cscoperelative|.
+
 				*'cscopetag'* *'cst'* *'nocscopetag'* *'nocst'*
 'cscopetag' 'cst'	boolean (default off)
 			global