diff --git a/INTERNALS.md b/INTERNALS.md
index 3f4ae1db..8ec81c07 100644
--- a/INTERNALS.md
+++ b/INTERNALS.md
@@ -26,7 +26,7 @@ article](https://blog.kevinjahns.de/are-crdts-suitable-for-shared-editing/).
 
 Each client is assigned a unique *clientID* property on first insert. This is a
 random 53-bit integer (53 bits because that fits in the javascript safe integer
-range).
+range \[JavaScript uses IEEE 754 floats\]).
 
 ## List items