diff --git a/codes/selectedNot.asm b/codes/selectedNot.asm
index e69ac45..fc3b737 100644
--- a/codes/selectedNot.asm
+++ b/codes/selectedNot.asm
@@ -6,8 +6,8 @@
 
 define:
     #   BIT     NOT selector
-    0 [ABC][DE][NSE]
-    1 [ABCD]{E}[NSE]
+    0 [ABC][DE][NSE].<U*>
+    1 [ABCD]{E}[NSE].<U*>
     NO [ABC][DE]{NSE}
     Nl [ABCD]{E}{NSE}
 
@@ -26,4 +26,4 @@ instructions: # O(12)
     {CDEN}             # remove write 0 mark
     {NSEG}             # remove unwraper
     {A*B*C*} {D*E*}    # write 0
-    {N*S*E*}           # lock all NOT selectors
\ No newline at end of file
+    {N*S*E*U*}         # lock all NOT selectors
\ No newline at end of file
diff --git a/codes/shiftRegister.asm b/codes/shiftRegister.asm
index 04e2e3d..a760314 100644
--- a/codes/shiftRegister.asm
+++ b/codes/shiftRegister.asm
@@ -1,18 +1,57 @@
 #
-# RULE 110 cellular automaton implementation in DNA|SIMD
+# Selected NOT in DNA|SIMD
 # @autor Lukáš Plevač <xpleva07@vutbr.cz>
-# @date 11.21.2023
+# @date 11.27.2023
 #
 
 define:
-    0 {A}[BCD][EF]
-    1 {A}{BCD}[EF]
+    #   BIT     NOT selector
+    0 [ABC][DE][NSE].<U*>
+    1 [ABCD]{E}[NSE].<U*>
 
 data:
-    01
+    #    Implicit zero
+    00110[ABC][DE][NSE]
+    #01100[ABC][DE][NSE]
+    #11000[ABC][DE][NSE]
+    00000[ABC][DE][NSE]
+    11111[ABC][DE][NSE]
 
-instructions:
-    # need mark for 10 and 01
-    {G*E*F*A*}     # mark 01
-    #{GEFA}         # remove mark 01
-    #{B*C*D*E*}     # write 1
\ No newline at end of file
+instructions: # O(34)
+    {NSEU}           # remove all notselectors selector
+    {D*E*N*}
+    {DEN}
+    {E*N*S*E*A*}
+    {D*E*N*S*E*G*}
+    {ENSEA}
+    {E*N*S*E*A*B*}
+    {ENSEAB}
+    {E*N*S*E*I*}     # bind not selector for 11
+    {N*S*E*A*B*C*F*}
+    {DENSEG}
+    {NSEABCF}
+    {D*E*N*S*E*A*B*}
+    {DENSEAB}
+    {E*N*S*E*Y*}
+    {B*C*D*}
+    {DENSEAB}
+    {ENSEI}          # remove temp not selector for 11
+    {N*S*E*U*}   # bind not selector for 00
+    {ENSEY}
+    {A*B*C*}     # write zero back
+    {D*E*}       # second zero part
+    # selected not subprogram
+    {G*D*E*N*}         # mark NOT 0 and NOT 1
+    {ABCD}             # remove unwraped 1
+    {GDEN}             # remove mark
+    {C*D*E*N*}         # mark write 0
+    {CDEN}             # remowe mark write 0 (is only posible when is unvraped for second part of zero)
+    {A*B*C*D*}         # write 1
+    {ABCD}             # remove not writed 1 (is unwraped by mark write 0)
+    {N*S*E*G*}         # unwrap write 0 mark
+    {CDEN}             # remove write 0 mark
+    {NSEG}             # remove unwraper
+    {A*B*C*} {D*E*}    # write 0
+    {N*S*E*U*}         # lock all NOT selectors
+
+    
\ No newline at end of file
diff --git a/src/SIMDDNA/assembly.py b/src/SIMDDNA/assembly.py
index 2fcfdb8..4f01cf2 100644
--- a/src/SIMDDNA/assembly.py
+++ b/src/SIMDDNA/assembly.py
@@ -74,6 +74,10 @@ class Assembly:
         gins = []
         for ins in asm:
             ins = re.sub("\s+" , " ", ins.strip()) # remove whitespaces
+            com = ""
+            if len(ins.split("#")) > 1:
+                com = ins.split("#")[1]
+            
             ins = ins.split("#")[0] # remove comments
             
             if "instructions:" in ins:
@@ -89,9 +93,12 @@ class Assembly:
                         DNAInsArray.append(molecule.parse(self.useMacros(DNAin)))
 
                 if len(DNAInsArray) > 0:
-                    gins.append(DNAInsArray)
+                    gins.append({
+                        "ins":     DNAInsArray,
+                        "comment": com
+                    })
 
-        return gins     
+        return gins  
     
     def decode(self, reg):
         mol = molecule.encode(reg.mol)
diff --git a/src/main.py b/src/main.py
index 9034b59..11c0d2f 100755
--- a/src/main.py
+++ b/src/main.py
@@ -10,6 +10,7 @@ parser.add_argument('assembly')
 parser.add_argument('-s', '--spaceing', default=" ", help='space sentense between ascii char of DNA strands')
 parser.add_argument('-v', '--verbose', help='show simulation step by step not only final', action='store_true', default=False)
 parser.add_argument('-d', '--decode', help='use macros to decode final result', action='store_true', default=False)
+parser.add_argument('-c', '--comments', help='show comments for instructions', action='store_true', default=False)
 
 args = parser.parse_args()
 
@@ -43,7 +44,11 @@ for ins in asm.getInstructions():
         print("=================================")
         print()
 
-        for insc in ins:
+        if args.comments:
+            print("#%s" % ins["comment"])
+            print("")
+
+        for insc in ins["ins"]:
             insc.rawPrint()
 
         print()
@@ -52,7 +57,7 @@ for ins in asm.getInstructions():
         print()
 
     for reg in regs:
-        reg.instruction(ins)
+        reg.instruction(ins["ins"])
         
         if args.verbose:
             reg.asciiShow(spaceing = args.spaceing)