diff --git a/README.md b/README.md
index 87b491f..0d35889 100644
--- a/README.md
+++ b/README.md
@@ -42,8 +42,8 @@ const tree = mdToJSON("Stay _foolish_, stay **hungry**!");
 
 md4w provides two webassembly binary files:
 
-- `md4w-fast.wasm`: Faster but larger binary file. (270KB gzipped)
-- `md4w-small.wasm`: Smaller but slower binary file. (27KB gzipped)
+- `md4w-fast.wasm`: Faster but larger binary file. (**270KB** gzipped)
+- `md4w-small.wasm`: Tiny but slower binary file. (**27KB** gzipped)
 
 By default, md4w uses the `md4w-fast.wasm` binary from file system, uses the `md4w-small.wasm` binary from CDN. You can also specify the wasm file by adding the `wasmMode` option.