diff --git a/main.cpp b/main.cpp
index 55315d4..fef471f 100644
--- a/main.cpp
+++ b/main.cpp
@@ -61,7 +61,7 @@ static void print_help()
 	printf("                                          supported commands.\n");
 	printf("    -j ,--jitter          jmin:jmax       similiar to -j above, but create jitter randomly between jmin and jmax\n");
 	printf("    -i,--interval         imin:imax       similiar to -i above, but scatter randomly between imin and imax\n");
-    printf("    --decode-buf          <number>        size of buffer of fec decoder,u nit: packet, default: 2000\n");
+    printf("    --decode-buf          <number>        size of buffer of fec decoder,unit: packet, default: 2000\n");
     printf("    --fix-latency         <number>        try to stabilize latency, only for mode 0\n");
     printf("    --delay-capacity      <number>        max number of delayed packets\n");
 	printf("    --disable-fec         <number>        completely disable fec, turn the program into a normal udp tunnel\n");