Apply suggestion from @richvdh

content/rooms/fragments/v1-floaty-power-levels.md

@@ -6,7 +6,7 @@ When the value is a float
  * Second, the value is truncated at the decimal point: `51146.98` becomes `51146`.
 
 Values outside the range represented by IEE754 binary64 (a "double") cause the
-powerlevel event to be rejected.
+powerlevel event to be rejected, as do `Infinity`, `-Infinity` and `NaN`.
 
 For example, this is a valid `m.room.power_levels` event in this room version:
 

content/rooms/v6.md

@@ -42,7 +42,8 @@ in [room version 5](/rooms/v5).
 ### Event format
 
 {{% added-in v=6 %}} Through enforcement of [Canonical JSON](#canonical-json),
-the `depth` limit has been reduced in this room version.
+the `depth` limit has been reduced in this room version, and numeric values may
+no longer be formatted as floats.
 
 {{% rver-fragment name="v6-event-format" %}}