README.md in rbpdf-1.21.0 vs README.md in rbpdf-1.21.1

@@ -14,10 +14,10 @@
 * RTL (Right-To-Left) languages support.
 * HTML tag support.
 * CSS minimum support.
 * Image
  - 8bit PNG image support without MiniMagick/RMagick library.
- - PNG(with alpha channel)/JPEG/GIF image support. (use MiniMagick or RMagick library)
+ - PNG(with alpha channel)/JPEG/GIF/WebP image support. (use MiniMagick or RMagick library)
 
 
 ##
 ## Installing RBPDF
 ##