diff --git a/src/fs.c b/src/fs.c
index 4d6c498..390a106 100644
--- a/src/fs.c
+++ b/src/fs.c
@@ -372,7 +372,7 @@ int createDir(const char *path) {
   }
 
   /* 为子目录内容分配块（默认 2 块 = 128 字节 = 2 条目） */
-  int subBlocks = 2;
+  int subBlocks = 16;
   int subStart = allocBlocks(subBlocks);
   if (subStart < 0) {
     logWrite(ERR, "createDir: failed to allocate %d blocks for dir", subBlocks);
diff --git a/src/main.c b/src/main.c
index dbc1665..29535b8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -27,6 +27,9 @@ int main(void) {
   shellRegister("mkfile", doMkfile,
                 UNDERLINE "mkfile <path> <size>\n" COLOR_RESET
                           "Create a file with given size");
+  shellRegister("touch", doMkfile,
+                UNDERLINE "touch <path> <size>\n" COLOR_RESET
+                          "Create a file with given size");
   shellRegister("mkdir", doMkdir,
                 UNDERLINE "mkdir <path>\n" COLOR_RESET "Create a subdirectory");
   shellRegister("rm", doRm,