diff --git a/misc/nacl/README b/misc/nacl/README
index b7163d3..99b94dc 100644
--- a/misc/nacl/README
+++ b/misc/nacl/README
@@ -11,7 +11,7 @@
    limited to a 4gb window.
  * nacl/arm which is 32-bit ARMv7A architecture with 1GB address space.
 
-For background it is recommended that you read http://golang.org/s/go13nacl.
+For background it is recommended that you read https://golang.org/s/go13nacl.
 
 Prerequisites
 -------------