Inserted submodule line

openlane/user_project_wrapper/config.tcl

diff --git a/openlane/user_project_wrapper/config.tcl b/openlane/user_project_wrapper/config.tcl
index 330cf57..1a79457 100755
--- a/openlane/user_project_wrapper/config.tcl
+++ b/openlane/user_project_wrapper/config.tcl
@@ -42,7 +42,8 @@
 ### Black-box verilog and views
 set ::env(VERILOG_FILES_BLACKBOX) "\
 	$script_dir/../../caravel/verilog/rtl/defines.v \
-	$script_dir/../../verilog/rtl/user_proj_example.v"
+	$script_dir/../../verilog/rtl/user_proj_example.v\
+	$script_dir/../../verilog/rtl/Per_32B.v"
 
 set ::env(EXTRA_LEFS) "\
 	$script_dir/../../lef/user_proj_example.lef"