diff --git a/makefile b/makefile
index 1f3cbb0..3be68c4 100644
--- a/makefile
+++ b/makefile
@@ -1,6 +1,6 @@
 # Makefile
 THIS_DIR := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
-
+RTL_DIR := $(THIS_DIR)/rtl
 
 # defaults
 SIM ?= icarus
@@ -22,15 +22,15 @@ all:	test_microprocessor  \
 # MODULE is the basename of the Python test file
 # use VHDL_SOURCES instead VERILOG_SOURCES of for VHDL files
 #Paths to HDL source files
-VERILOG_SOURCES	+= $(THIS_DIR)/CombinedCUnDP.v
-VERILOG_SOURCES += $(THIS_DIR)/CU.v
-VERILOG_SOURCES += $(THIS_DIR)/DP.v
-
-VERILOG_SOURCES += $(THIS_DIR)/DFF_reg.v
-VERILOG_SOURCES += $(THIS_DIR)/RAM.v
-VERILOG_SOURCES += $(THIS_DIR)/addSubstractor.v
-VERILOG_SOURCES += $(THIS_DIR)/mux2to1.v
-VERILOG_SOURCES += $(THIS_DIR)/mux4to1.v
+VERILOG_SOURCES	+= $(RTL_DIR)/CombinedCUnDP.v
+VERILOG_SOURCES += $(RTL_DIR)/CU.v
+VERILOG_SOURCES += $(RTL_DIR)/DP.v
+
+VERILOG_SOURCES += $(RTL_DIR)/DFF_reg.v
+VERILOG_SOURCES += $(RTL_DIR)/RAM.v
+VERILOG_SOURCES += $(RTL_DIR)/addSubstractor.v
+VERILOG_SOURCES += $(RTL_DIR)/mux2to1.v
+VERILOG_SOURCES += $(RTL_DIR)/mux4to1.v
 
 
 test_microprocessor:
diff --git a/AlteraDE1_SimpleProcessor.v b/rtl/AlteraDE1_SimpleProcessor.v
similarity index 100%
rename from AlteraDE1_SimpleProcessor.v
rename to rtl/AlteraDE1_SimpleProcessor.v
diff --git a/CU.v b/rtl/CU.v
similarity index 100%
rename from CU.v
rename to rtl/CU.v
diff --git a/CombinedCUnDP.v b/rtl/CombinedCUnDP.v
similarity index 100%
rename from CombinedCUnDP.v
rename to rtl/CombinedCUnDP.v
diff --git a/DFF_reg.v b/rtl/DFF_reg.v
similarity index 100%
rename from DFF_reg.v
rename to rtl/DFF_reg.v
diff --git a/DP.v b/rtl/DP.v
similarity index 100%
rename from DP.v
rename to rtl/DP.v
diff --git a/RAM.v b/rtl/RAM.v
similarity index 100%
rename from RAM.v
rename to rtl/RAM.v
diff --git a/addSubstractor.v b/rtl/addSubstractor.v
similarity index 100%
rename from addSubstractor.v
rename to rtl/addSubstractor.v
diff --git a/mux2to1.v b/rtl/mux2to1.v
similarity index 100%
rename from mux2to1.v
rename to rtl/mux2to1.v
diff --git a/mux4to1.v b/rtl/mux4to1.v
similarity index 100%
rename from mux4to1.v
rename to rtl/mux4to1.v