diff --git a/doc/chain-self-management-sketch.org b/doc/chain-self-management-sketch.org
index f50d1da..fcd8f8b 100644
--- a/doc/chain-self-management-sketch.org
+++ b/doc/chain-self-management-sketch.org
@@ -367,7 +367,7 @@ document presents a detailed example.)
 * 9. Diagram of the self-management algorithm
 ** Introduction
 Refer to the diagram
-[[https://github.com/basho/machi/blob/master/doc/chain-self-management-sketch.Diagram1.pdf][`chain-self-management-sketch.Diagram1.pdf`]],
+[[https://github.com/basho/machi/blob/master/doc/chain-self-management-sketch.Diagram1.pdf][chain-self-management-sketch.Diagram1.pdf]],
 a flowchart of the
 algorithm.  The code is structured as a state machine where function
 executing for the flowchart's state is named by the approximate