diff --git a/theatre/studio/src/utils/absoluteDims.tsx b/theatre/studio/src/utils/absoluteDims.tsx
index 065b05d..a66ccc8 100644
--- a/theatre/studio/src/utils/absoluteDims.tsx
+++ b/theatre/studio/src/utils/absoluteDims.tsx
@@ -1,3 +1,4 @@
+/** Create CSS rule string for centered and give it this width and height */
 export const absoluteDims = (w: number, h = w) => `
   left: ${w * -0.5}px;
   top: ${h * -0.5}px;