diff --git a/README.md b/README.md
index 36889c2..9fc340c 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ All categories saved inside path of `category/`, you can see existed categories.
 
 **b. Add new Posts**
 
-* All posts bassed on markdown syntax _(please googling)_. allowed extensions if `*.markdown` or `*.md`.
+* All posts bassed on markdown syntax _(please googling)_. allowed extensions is `*.markdown` or `*.md`.
 * This files can found at the path of `_posts/`.
 * and the name of files are following `<date:%Y-%m-%d>-<slug>.<extension>`, for example: