diff --git a/src/cmd/compile/internal/ssa/_gen/rulegen.go b/src/cmd/compile/internal/ssa/_gen/rulegen.go
index b6356315014..4374d3e153f 100644
--- a/src/cmd/compile/internal/ssa/_gen/rulegen.go
+++ b/src/cmd/compile/internal/ssa/_gen/rulegen.go
@@ -5,7 +5,8 @@
 // This program generates Go code that applies rewrite rules to a Value.
 // The generated code implements a function of type func (v *Value) bool
 // which reports whether if did something.
-// Ideas stolen from Swift: http://www.hpl.hp.com/techreports/Compaq-DEC/WRL-2000-2.html
+// Ideas stolen from the Swift Java compiler:
+// https://bitsavers.org/pdf/dec/tech_reports/WRL-2000-2.pdf
 
 package main