diff --git a/src/cmd/yacc/doc.go b/src/cmd/yacc/doc.go
index 7839dcfa9c..328d87b9da 100644
--- a/src/cmd/yacc/doc.go
+++ b/src/cmd/yacc/doc.go
@@ -20,7 +20,7 @@ written in C and documented at
 Adepts of the original yacc will have no trouble adapting to this
 form of the tool.
 
-The directory $GOROOT/cmd/yacc/testdata/expr is a yacc program
+The directory $GOROOT/src/cmd/yacc/testdata/expr is a yacc program
 for a very simple expression parser. See expr.y and main.go in that
 directory for examples of how to write and build yacc programs.