diff --git a/train_gpt2.cu b/train_gpt2.cu
index 70d8d0c5a..04565b37e 100644
--- a/train_gpt2.cu
+++ b/train_gpt2.cu
@@ -1408,7 +1408,7 @@ void error_usage() {
     fprintf(stderr, "  -pn <int>    num_processes (default = 1)\n");
     fprintf(stderr, "  -pr <int>    process_rank (default = 0)\n");
     fprintf(stderr, "  -pg <int>    gpus_per_node (default = 8)\n");
-    fprintf(stderr, "  -pm <string> nccl_init_method: tcp,fs,mpi (default = mpi)\n");
+    fprintf(stderr, "  -pi <string> nccl_init_method: tcp,fs,mpi (default = mpi)\n");
     fprintf(stderr, "  -ps <string> server_ip - used only when nccl_init_method is tcp (default = -1)\n");
     fprintf(stderr, "  -pp <string> fs_path - used only when nccl_init_method is fs (default = /tmp)\n");
     exit(EXIT_FAILURE);