diff --git a/index.bs b/index.bs
index 0fbe0df..bdbe6df 100644
--- a/index.bs
+++ b/index.bs
@@ -1896,31 +1896,6 @@ a [=virtual sensor metadata=] for use in [=per-type virtual sensor metadata=].
1. Return |reading|.
-
Parse quaternion reading
-
-
- : input
- :: |parameters|, a JSON {{Object}}
- : output
- :: A [=sensor reading=] or **undefined**
-
- 1. Let |quaternionArray| be the result of invoking [=get a property=] from |parameters| with
- "`quaternion`".
- 1. If |quaternionArray| is not an {{Array}}, or if its "`length`" property is not 4, return
- **undefined**.
- 1. Let |x| be the result of invoking [=get a property=] from |quaternionArray| with 0.
- 1. If |x| is not a {{Number}}, or its value is **NaN**, +∞, or −∞, return **undefined**.
- 1. Let |y| be the result of invoking [=get a property=] from |quaternionArray| with 1.
- 1. If |y| is not a {{Number}}, or its value is **NaN**, +∞, or −∞, return **undefined**.
- 1. Let |z| be the result of invoking [=get a property=] from |quaternionArray| with 2.
- 1. If |z| is not a {{Number}}, or its value is **NaN**, +∞, or −∞, return **undefined**.
- 1. Let |w| be the result of invoking [=get a property=] from |quaternionArray| with 3.
- 1. If |w| is not a {{Number}}, or its value is **NaN**, +∞, or −∞, return **undefined**.
- 1. Let |reading| be a new [=sensor reading=].
- 1. [=map/Set=] |reading|["`quaternion`"] be the [=/list=] « |x|, |y|, |z|, |w| ».
- 1. Return |reading|.
-
-
### Delete virtual sensor ### {#delete-virtual-sensor-command}