diff --git a/docs/structures/content-format.md b/docs/structures/content-format.md
index 12a5398..c51b859 100644
--- a/docs/structures/content-format.md
+++ b/docs/structures/content-format.md
@@ -23,6 +23,7 @@ interface ContentFormat {
     }
 }
 ```
+To maintain compatibility with strongly types languages, numbers MUST fit within a [u64](https://doc.rust-lang.org/std/primitive.u64.html).
 
 Here's an example of how this structure can be used:
 
@@ -99,4 +100,4 @@ However, this is not:
 
 Each `ContentFormat` object should be treated as a **single file in multiple optional formats**, not as multiple files. The multiple formats are intended to optimize bandwidth usage.
 
-If optional fields are provided for one object in the `ContentFormat`, they should be provided for all objects in the `ContentFormat`. For instance, if the `description` field is provided for one object, it should be provided for all objects, as they represent the same file.
\ No newline at end of file
+If optional fields are provided for one object in the `ContentFormat`, they should be provided for all objects in the `ContentFormat`. For instance, if the `description` field is provided for one object, it should be provided for all objects, as they represent the same file.