diff --git a/lib/philomena_web/templates/image/_image_page.html.slime b/lib/philomena_web/templates/image/_image_page.html.slime
index 28c4344d..8c7bb815 100644
--- a/lib/philomena_web/templates/image/_image_page.html.slime
+++ b/lib/philomena_web/templates/image/_image_page.html.slime
@@ -4,10 +4,12 @@
   - else
     #thumbnails-not-yet-generated.block.block--fixed.block--warning.layout--narrow
       h3 Just a moment
-      p The image should appear in a few minutes; report it otherwise.
+      = if @image.image_mime_type == "video/webm" do
+        p WEBM uploads may take longer to process, it should appear in up to an hour (depending on file size and video length).
+      - else
+        p The image should appear in a few minutes; report it otherwise.
       p Implications might have added tags, so check them in the meanwhile.
-
   = if !@image.processed and @image.thumbnails_generated do
     br
     #image-being-optimized.block.block--fixed.block--warning.layout--narrow
-      | This image is being processed to optimize the filesize. It should finish shortly.
\ No newline at end of file
+      | This image is being processed to optimize the filesize. It should finish shortly.