diff --git a/kernel/register.cc b/kernel/register.cc
index f6f5804b..9f6fe37d 100644
--- a/kernel/register.cc
+++ b/kernel/register.cc
@@ -149,12 +149,15 @@ void Pass::call(RTLIL::Design *design, std::string command)
 		std::string str = p;
 		int strsz = str.size();
 		if (strsz > 0 && str[strsz-1] == ';') {
+			int num_semikolon = 0;
 			while (strsz > 0 && str[strsz-1] == ';')
-				strsz--;
+				strsz--, num_semikolon++;
 			if (strsz > 0)
 				args.push_back(str.substr(0, strsz));
 			call(design, args);
 			args.clear();
+			if (num_semikolon == 2)
+				call(design, "clean");
 		} else
 			args.push_back(str);
 	}
diff --git a/passes/opt/opt_clean.cc b/passes/opt/opt_clean.cc
index 183d6757..17f4168d 100644
--- a/passes/opt/opt_clean.cc
+++ b/passes/opt/opt_clean.cc
@@ -313,6 +313,9 @@ struct CleanPass : public Pass {
 		log("\n");
 		log("This is identical to opt_clean, but less verbose.\n");
 		log("\n");
+		log("When commands are seperated using the ';;' token, this command will be executed\n");
+		log("between the commands.\n");
+		log("\n");
 	}
 	virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
 	{