diff --git a/src/splat-convert.ts b/src/splat-convert.ts
index 67d7b14..5cbdcbe 100644
--- a/src/splat-convert.ts
+++ b/src/splat-convert.ts
@@ -75,6 +75,7 @@ const convertPly = (convertData: ConvertEntry[]) => {
         `ply`,
         `format binary_little_endian 1.0`,
         `comment ${generatedByString}`,
+        `comment Vertical Axis: y`,
         `element vertex ${totalSplats}`,
          propNames.map(p => `property float ${p}`),
          `end_header`,