diff --git a/docs/structures/content-format.md b/docs/structures/content-format.md
index af507d3..baf5ed5 100644
--- a/docs/structures/content-format.md
+++ b/docs/structures/content-format.md
@@ -17,7 +17,7 @@ interface ContentFormat {
         fps?: number; // unsigned 64-bit integer
         width?: number; // unsigned 64-bit integer
         height?: number; // unsigned 64-bit integer
-        duration?: number; // unsigned 64-bit integer
+        duration?: number; // unsigned 64-bit float
     }
 }
 ```