diff --git a/Documentation/markdown.md b/Documentation/markdown.md
index 23e3bae..e6b766c 100644
--- a/Documentation/markdown.md
+++ b/Documentation/markdown.md
@@ -443,8 +443,8 @@
 Relative and absolute links to image files within the Git repository
 (such as `../images/banner.png`) are resolved during rendering by
 inserting the base64 encoding of the image using a `data:` URI.  Only
-PNG (`*.png`), JPEG (`*.jpg` or `*.jpeg`) and GIF (`*.gif`) image
-formats are supported when referenced from the Git repository.
+PNG (`*.png`), JPEG (`*.jpg` or `*.jpeg`), GIF (`*.gif`) and WebP (`*.webp`)
+image formats are supported when referenced from the Git repository.
 
 Unsupported extensions or files larger than [image size](#Image-size)
 limit (default 256K) will display a broken image.
diff --git a/java/com/google/gitiles/doc/ImageLoader.java b/java/com/google/gitiles/doc/ImageLoader.java
index 3e536d7..81724b6 100644
--- a/java/com/google/gitiles/doc/ImageLoader.java
+++ b/java/com/google/gitiles/doc/ImageLoader.java
@@ -34,7 +34,7 @@
 class ImageLoader {
   private static final Logger log = LoggerFactory.getLogger(ImageLoader.class);
   private static final ImmutableSet<String> ALLOWED_TYPES =
-      ImmutableSet.of("image/gif", "image/jpeg", "image/png");
+      ImmutableSet.of("image/gif", "image/jpeg", "image/png", "image/webp");
 
   private final ObjectReader reader;
   private final GitilesView view;
diff --git a/resources/com/google/gitiles/mime-types.properties b/resources/com/google/gitiles/mime-types.properties
index 0b4bd26..8cc19b4 100644
--- a/resources/com/google/gitiles/mime-types.properties
+++ b/resources/com/google/gitiles/mime-types.properties
@@ -13,4 +13,5 @@
 svg = image/svg+xml
 tiff = image/tiff
 txt = text/plain
+webp = image/webp
 xml = text/xml