diff --git a/description.md b/description.md
index 36eac9f..9776fe6 100644
--- a/description.md
+++ b/description.md
@@ -108,7 +108,7 @@ buckets:
         mode: jit   # 'jit', 'aot' or 'realtime' are allowed.
         
         formats:                 
-          png: true  # Disable PNG encoding.
+          png: false  # Disable PNG encoding.
           jpeg: true  # Enable JPEG encoding.
           webp: true  # Enable WebP encoding.
           gif: false  # Disable GIF encoding.
@@ -175,4 +175,4 @@ buckets:
         # The *bucket local* max concurrent operations.
         # No limit is applied if left unset.
         max_concurrency: 200
-```
\ No newline at end of file
+```