diff --git a/content/rooms/fragments/v1-floaty-power-levels.md b/content/rooms/fragments/v1-floaty-power-levels.md
index 52a198f6..abd4f50a 100644
--- a/content/rooms/fragments/v1-floaty-power-levels.md
+++ b/content/rooms/fragments/v1-floaty-power-levels.md
@@ -32,3 +32,9 @@ For example, this is a valid `m.room.power_levels` event in this room version:
 
 In this example, both `@bob:localhost` and `@alice:localhost` have the same effective
 power level of `50`, even though the values are technically different.
+
+When a float written in exponential notation is unpacked, the decimal portion is removed
+afterward; for example, `5.114698E4` becomes `51146.98`, which is then truncated to `51146`.
+
+Note that, since this room version does not enforce that events comply with the requirements
+of [Canonical JSON](/appendices#canonical-json), power levels can be formatted as floats.