diff --git a/openair1/SIMULATION/NR_PHY/dlsim.c b/openair1/SIMULATION/NR_PHY/dlsim.c
index e9af64ed3c..1f597a3c0b 100644
--- a/openair1/SIMULATION/NR_PHY/dlsim.c
+++ b/openair1/SIMULATION/NR_PHY/dlsim.c
@@ -356,7 +356,7 @@ int main(int argc, char **argv)
 
   FILE *scg_fd=NULL;
 
-  while ((c = getopt(argc, argv, "--:O:f:hA:p:f:g:i:n:s:S:t:v:x:y:z:o:M:N:F:GR:d:PI:L:a:b:e:m:w:T:U:q:X:Y:Z:")) != -1) {
+  while ((c = getopt(argc, argv, "--:O:f:hA:p:f:g:i:n:s:S:t:v:x:y:z:o:H:M:N:F:GR:d:PI:L:a:b:e:m:w:T:U:q:X:Y:Z:")) != -1) {
 
     /* ignore long options starting with '--', option '-O' and their arguments that are handled by configmodule */
     /* with this opstring getopt returns 1 for non-option arguments, refer to 'man 3 getopt' */
@@ -541,6 +541,7 @@ int main(int argc, char **argv)
       //target_error_rate=0.1;
       slot = 0;
       break;
+
     case 'Z' :
       filename_csv = strdup(optarg);
       AssertFatal(filename_csv != NULL, "strdup() error: errno %d\n", errno);
@@ -550,6 +551,10 @@ int main(int argc, char **argv)
       delay = atoi(optarg);
       break;
 
+    case 'H':
+      slot = atoi(optarg);
+      break;
+
     default:
     case 'h':
       printf("%s -h(elp) -p(extended_prefix) -N cell_id -f output_filename -F input_filename -g channel_model -n n_frames -s snr0 -S snr1 -x transmission_mode -y TXant -z RXant -i Intefrence0 -j Interference1 -A interpolation_file -C(alibration offset dB) -N CellId\n",
@@ -583,6 +588,7 @@ int main(int argc, char **argv)
       printf("-f raw file containing RRC configuration (generated by gNB)\n");
       printf("-g Channel model: [A] TDLA30, [B] TDLB100, [C] TDLC300, e.g. -g A\n");
       printf("-h This message\n");
+      printf("-H Slot number\n");
       printf("-i Change channel estimation technique. Arguments list: Frequency domain {0:Linear interpolation, 1:PRB based averaging}, Time domain {0:Estimates of last DMRS symbol, 1:Average of DMRS symbols}\n");
       printf("-m Numerology\n");
       printf("-n Number of frames to simulate\n");