diff --git a/tips/TIP-0045/tip-0045.md b/tips/TIP-0045/tip-0045.md
index 266bb7f4f..00b1fe65f 100644
--- a/tips/TIP-0045/tip-0045.md
+++ b/tips/TIP-0045/tip-0045.md
@@ -972,6 +972,9 @@ to be valid, the following conditions must hold:
   previous byte, the indices continue where the previous byte's indices left off.
   - For example: In a list of two bytes with the bit patterns `0001 0000` and `0000 0100`, bits with indices `4` and
     `10` are set.
+- There must be no trailing zero bytes in the byte array.
+  - This rule ensures that two transactions whose content is identical, and in particular, that have the same
+    capabilities will have the same binary representation.
 
 #### Capability Flags