diff --git a/dsmbr/dsmbr.cc b/dsmbr/dsmbr.cc
index 3aa7f69..170febe 100755
--- a/dsmbr/dsmbr.cc
+++ b/dsmbr/dsmbr.cc
@@ -557,6 +557,7 @@ usage()
 	    "    -v: verbose mode.\n"
 	    "    -t: run time.\n"
 	    "    -T: warmup time.\n"
+		"    -d: request depth.\n"
 	    "    -i: interarrival time distribution.\n"
 	    "    -O: module arguments ('key'='value'), repeatable.\n\n");
 }
@@ -596,7 +597,7 @@ static void
 dsmbr_getopt(int argc, char *argv[])
 {
 	int ch;
-	while ((ch = getopt(argc, argv, "q:s:p:o:a:c:m:M:Svt:T:i:O:h")) != -1) {
+	while ((ch = getopt(argc, argv, "q:s:p:o:a:c:m:M:Svt:T:i:O:d:h")) != -1) {
 		switch (ch) {
 		case 'q': {
 			options.target_qps = strtoul(optarg, NULL, 10);
@@ -674,6 +675,10 @@ dsmbr_getopt(int argc, char *argv[])
 			options.mod_argc++;
 			break;
 		}
+		case 'd' : {
+			options.depth = strtoul(optarg, NULL, 10);
+			break;
+		}
 		case 'h':
 			usage();
 			exit(0);