diff --git a/.github/workflows/map-diff.yml b/.github/workflows/map-diff.yml
index 745d132c1c6..5a8348d2511 100644
--- a/.github/workflows/map-diff.yml
+++ b/.github/workflows/map-diff.yml
@@ -60,12 +60,11 @@ jobs:
           json=$(curl -s -F image=@diff_image.png https://api.imgur.com/3/upload | tee /dev/stderr)
 
           log 'Generating HTML comment...'
-          html=$(printf %s "$json" | jq -rRs --arg path "$map_path" --arg dim "$old_dim -> $new_dim" '. as $input |
-            try fromjson catch ({error:$input}) | @html "
-            <h3>\($path)</h3><p>dimensions: \($dim)</p>
-            <img src=\"\(.data.link)\" alt=\"\(if .data.link then "map diff image" else "image upload failed" end)\"/><br/>
-            <details><summary>imgur response</summary><p>\(tojson)</p></details>"')
-          comment_body+=$html
+          # careful with leading spaces in the output since it is ultimately markdown (with embedded html) so the indentation may have meaning
+          html=$(printf %s "$json" | jq -rRs --arg path "$map_path" --arg dim "$old_dim ➔ $new_dim" '. as $input |
+            try fromjson catch ({error:$input}) | (if .data.link then "map diff image" else "image upload failed" end) as $alt |
+            @html "<h3>\($path)</h3><p>dimensions: \($dim)</p><img src=\"\(.data.link)\" alt=\"\($alt)\"/><br/><details><summary>imgur response</summary><p>\(tojson)</p></details>"')
+          comment_body+=$html$'\n'
         done
 
         [[ $comment_body ]] || err Failed to generate comment