diff --git a/Image-IO.md b/Image-IO.md
index 99f0c42..5d8bce7 100644
--- a/Image-IO.md
+++ b/Image-IO.md
@@ -38,7 +38,7 @@ As of Mapnik 2.3.x the following formats are supported:
 
 In Mapnik >= 2.3.x by default:
 
- - PNG output is full color png (aka. `png24` or `png32)
+ - PNG output is full color png (aka. `png24` or `png32`)
  - JPEG output uses a `quality` of 85.
  - TIFF output uses `PHOTOMETRIC_RGB` and `COMPRESSION_DEFLATE`
  - WEBP output uses all WEBP encoder defaults meaning lossy compression (`lossless=0`) and a default quality of `75` (`quality=75`).