diff --git a/README.md b/README.md
index 4fce884..ea76474 100644
--- a/README.md
+++ b/README.md
@@ -58,8 +58,9 @@ You can customize formatting using some variables.
 - `g:clang_format#code_style`
 
 `g:clang_format#code_style` is a base style.
-`llvm`, `google`, `chromium`, `mozilla` is supported.
+`llvm`, `google`, `chromium`, `mozilla`, `microsoft` is supported.
 The default value is `google`.
+Please note that 'microsoft' style is added in clang-format 9.
 
 - `g:clang_format#style_options`
 
diff --git a/doc/clang-format.txt b/doc/clang-format.txt
index 7dccce8..968a867 100644
--- a/doc/clang-format.txt
+++ b/doc/clang-format.txt
@@ -130,7 +130,7 @@ g:clang_format#command                                  *g:clang_format#command*
 g:clang_format#code_style                            *g:clang_format#code_style*
 
     Base coding style for formatting.  Available coding styles are "llvm",
-    "google", "chromium" and "mozilla".
+    "google", "chromium", "mozilla" and "microsoft".
     The default value is "google".
 
 g:clang_format#style_options                      *g:clang_format#style_options*