diff --git a/sdc-plugin/clocks.h b/sdc-plugin/clocks.h
index ff02bd5..f5b491c 100644
--- a/sdc-plugin/clocks.h
+++ b/sdc-plugin/clocks.h
@@ -71,6 +71,9 @@
     void Propagate(BufferPropagation* pass);
     void Propagate(ClockDividerPropagation* pass);
     void WriteSdc(std::ostream& file);
+    const std::vector<Clock> GetClocks() {
+	return clocks_;
+    }
 
    private:
     std::vector<Clock> clocks_;
diff --git a/sdc-plugin/sdc.cc b/sdc-plugin/sdc.cc
index 4233d01..5f8cad1 100644
--- a/sdc-plugin/sdc.cc
+++ b/sdc-plugin/sdc.cc
@@ -21,6 +21,8 @@
 #include "kernel/register.h"
 #include "kernel/rtlil.h"
 #include "propagation.h"
+#include "set_false_path.h"
+#include "sdc_writer.h"
 
 USING_YOSYS_NAMESPACE
 
@@ -57,8 +59,8 @@
 };
 
 struct WriteSdcCmd : public Backend {
-    WriteSdcCmd(Clocks& clocks)
-        : Backend("sdc", "Write SDC file"), clocks_(clocks) {}
+    WriteSdcCmd(Clocks& clocks, SdcWriter& sdc_writer)
+        : Backend("sdc", "Write SDC file"), clocks_(clocks), sdc_writer_(sdc_writer) {}
 
     void help() override {
 	log("\n");
@@ -75,10 +77,11 @@
 	}
 	log("\nWriting out clock constraints file(SDC)\n");
 	extra_args(f, filename, args, 1);
-	clocks_.WriteSdc(*f);
+	sdc_writer_.WriteSdc(clocks_, *f);
     }
 
     Clocks& clocks_;
+    SdcWriter& sdc_writer_;
 };
 
 struct CreateClockCmd : public Pass {
@@ -246,10 +249,11 @@
 class SdcPlugin {
    public:
     SdcPlugin()
-        : write_sdc_cmd_(clocks_),
+        : write_sdc_cmd_(clocks_, sdc_writer_),
           create_clock_cmd_(clocks_),
           get_clocks_cmd_(clocks_),
-          propagate_clocks_cmd_(clocks_) {
+          propagate_clocks_cmd_(clocks_),
+          set_false_path_cmd_(sdc_writer_) {
 	log("Loaded SDC plugin\n");
     }
 
@@ -258,9 +262,11 @@
     CreateClockCmd create_clock_cmd_;
     GetClocksCmd get_clocks_cmd_;
     PropagateClocksCmd propagate_clocks_cmd_;
+    SetFalsePath set_false_path_cmd_;
 
    private:
     Clocks clocks_;
+    SdcWriter sdc_writer_;
 } SdcPlugin;
 
 PRIVATE_NAMESPACE_END
diff --git a/sdc-plugin/set_false_path.cc b/sdc-plugin/set_false_path.cc
new file mode 100644
index 0000000..72bb41c
--- /dev/null
+++ b/sdc-plugin/set_false_path.cc
@@ -0,0 +1,90 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2020  The Symbiflow Authors
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#include "set_false_path.h"
+#include <regex>
+#include "kernel/log.h"
+#include "sdc_writer.h"
+
+USING_YOSYS_NAMESPACE
+
+void SetFalsePath::help() {
+    //   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+    log("\n");
+    log("   set_false_path [-quiet] [-from <net_name>] [-to <net_name>] \n");
+    log("\n");
+    log("Set false path on the specified net\n");
+    log("\n");
+    log("Print the output to stdout too. This is useful when all Yosys is "
+        "executed.\n");
+    log("\n");
+    log("    -quiet\n");
+    log("        Don't print the result of the execution to stdout.\n");
+    log("\n");
+    log("    -from\n");
+    log("        List of start points or clocks.\n");
+    log("\n");
+    log("    -to\n");
+    log("        List of end points or clocks.\n");
+    log("\n");
+}
+
+void SetFalsePath::execute(std::vector<std::string> args,
+                           RTLIL::Design* design) {
+    RTLIL::Module* top_module = design->top_module();
+    if (top_module == nullptr) {
+	log_cmd_error("No top module detected\n");
+    }
+
+    size_t argidx;
+    bool is_quiet = false;
+    std::string from_pin;
+    std::string to_pin;
+
+    // Parse command arguments
+    for (argidx = 1; argidx < args.size(); argidx++) {
+	std::string arg = args[argidx];
+	if (arg == "-quiet") {
+	    is_quiet = true;
+	    continue;
+	}
+
+	if (arg == "-from" and argidx + 1 < args.size()) {
+	    from_pin = args[++argidx];
+	    log("From: %s\n", from_pin.c_str());
+	    continue;
+	}
+
+	if (arg == "-to" and argidx + 1 < args.size()) {
+	    to_pin = args[++argidx];
+	    log("To: %s\n", to_pin.c_str());
+	    continue;
+	}
+
+	if (arg.size() > 0 and arg[0] == '-') {
+	    log_cmd_error("Unknown option %s.\n", arg.c_str());
+	}
+
+	break;
+    }
+    if (!is_quiet) {
+	std::string msg = (from_pin.empty()) ? "" : "-from " + from_pin;
+	msg += (to_pin.empty()) ? "" : " -to " + to_pin;
+	log("Adding false path %s\n", msg.c_str());
+    }
+    sdc_writer_.AddFalsePath(FalsePath{.from_pin = from_pin, .to_pin = to_pin});
+}
diff --git a/sdc-plugin/set_false_path.h b/sdc-plugin/set_false_path.h
new file mode 100644
index 0000000..47bf08a
--- /dev/null
+++ b/sdc-plugin/set_false_path.h
@@ -0,0 +1,39 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2020  The Symbiflow Authors
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#ifndef _SET_FALSE_PATH_H_
+#define _SET_FALSE_PATH_H_
+
+#include "kernel/register.h"
+#include "kernel/rtlil.h"
+#include "sdc_writer.h"
+
+USING_YOSYS_NAMESPACE
+
+struct SetFalsePath : public Pass {
+    SetFalsePath(SdcWriter& sdc_writer)
+        : Pass("set_false_path", "Set false path on net"),
+          sdc_writer_(sdc_writer) {}
+
+    void help() override;
+
+    void execute(std::vector<std::string> args, RTLIL::Design* design) override;
+
+    SdcWriter& sdc_writer_;
+};
+
+#endif  //_SET_FALSE_PATH_H_