[top_earlgrey] Fix documentation how to use topgen
diff --git a/hw/top_earlgrey/README.md b/hw/top_earlgrey/README.md
index 78614e9..8a4697e 100644
--- a/hw/top_earlgrey/README.md
+++ b/hw/top_earlgrey/README.md
@@ -13,7 +13,7 @@
 is created with below command.
 
 ```console
-../../util/topgen.py -t doc/top_earlgrey.hjson -c doc/top_earlgrey.tpl.sv -o . -v
+../../util/topgen.py -t doc/top_earlgrey.hjson -c doc -o . -v
 ```
 
 It generates files below: