diff --git a/README.md b/README.md
index 4fffa9571cfd19995903b755a167871a7640af5c..f25f5d84affb8ad7d3e42e727717828e63708c9c 100644
--- a/README.md
+++ b/README.md
@@ -3,47 +3,47 @@ Cunix kernel
 
 # Versions
 `0.362s-boot`:  
-    `Boot` read `loader` from `boot-device`, then it jumps to it.  
-    Loader doesn't load anything, it just enable long-mode and paging.  
-    Loader defines temporary page table at `0x70000` (0x0000:0x7000),  
-    it uses `2MB` page to make 0-12 MB memory to `0x0000 - 0xc0000`.  
+&nbsp&nbsp&nbsp&nbsp`Boot` read `loader` from `boot-device`, then it jumps to it.  
+&nbsp&nbsp&nbsp&nbspLoader doesn't load anything, it just enable long-mode and paging.  
+&nbsp&nbsp&nbsp&nbspLoader defines temporary page table at `0x70000` (0x0000:0x7000),  
+&nbsp&nbsp&nbsp&nbspit uses `2MB` page to make 0-12 MB memory to `0x0000 - 0xc0000`.  
 
 
 `0.385s-boot`:  
-    rebuild `boot` and `loader`.  
+&nbsp&nbsp&nbsp&nbsprebuild `boot` and `loader`.  
 
 
 `0.391s-boot`:  
-    `loader` forgot open A20 line, so `0.385` and `0.362` just can
-    use 1MB memory like real-mode.  
+&nbsp&nbsp&nbsp&nbsp`loader` forgot open A20 line, so `0.385` and `0.362` just can
+&nbsp&nbsp&nbsp&nbspuse 1MB memory like real-mode.  
 
 
 `0.432s-boot`:  
-    make directory `include/`, and add segment.inc, but it doesn't work. :-)  
+&nbsp&nbsp&nbsp&nbspmake directory `include/`, and add segment.inc, but it doesn't work. :-)  
 
 
 `0.451s-boot`:  
-    `boot` can load 8 sectors (4KB) of loader (not 1 sector).  
+&nbsp&nbsp&nbsp&nbsp`boot` can load 8 sectors (4KB) of loader (not 1 sector).  
 
 
 `0.466s-boot`:  
-    rebuild `boot`
-
+&nbsp&nbsp&nbsp&nbsprebuild `boot`
+    
 
 `0.487s-boot`:  
-    `loader` let FS can access 4GB memory in real-mode. because 
-    `loader` loaded GDT and load a data-segment to fs, then disable
-    protect-mode. 
+&nbsp&nbsp&nbsp&nbsp`loader` let FS can access 4GB memory in real-mode. because 
+&nbsp&nbsp&nbsp&nbsp`loader` loaded GDT and load a data-segment to fs, then disable
+&nbsp&nbsp&nbsp&nbspprotect-mode. 
 
 
 `0.484s-boot`:
-    let `readdisk.inc` smaller, but we just can use CHS or LBA, not both. 
+&nbsp&nbsp&nbsp&nbsplet `readdisk.inc` smaller, but we just can use CHS or LBA, not both. 
 
 
 `0.509s-kernel`: 
-    load kernel to 0x8200-0x9200 for 4KB, kernel.asm display 'K' to screen. 
+&nbsp&nbsp&nbsp&nbspload kernel to 0x8200-0x9200 for 4KB, kernel.asm display 'K' to screen. 
 
 `0.556s-int`: 
-    init IDT at 0x0000-0x1000, and set all handler at ignore_int, but it do nothing. 
+&nbsp&nbsp&nbsp&nbspinit IDT at 0x0000-0x1000, and set all handler at ignore_int, but it do nothing.