diff --git a/metric/doc.go b/metric/doc.go
index f153745b0..339cf563f 100644
--- a/metric/doc.go
+++ b/metric/doc.go
@@ -24,10 +24,10 @@ all instruments fall into two overlapping logical categories: asynchronous or
 synchronous, and int64 or float64.
 
 All synchronous instruments ([Int64Counter], [Int64UpDownCounter],
-[Int64Histogram], [Float64Counter], [Float64UpDownCounter], and
-[Float64Histogram]) are used to measure the operation and performance of source
-code during the source code execution. These instruments only make measurements
-when the source code they instrument is run.
+[Int64Histogram], [Int64Gauge], [Float64Counter], [Float64UpDownCounter],
+[Float64Histogram], and [Float64Gauge]) are used to measure the operation and
+performance of source code during the source code execution. These instruments
+only make measurements when the source code they instrument is run.
 
 All asynchronous instruments ([Int64ObservableCounter],
 [Int64ObservableUpDownCounter], [Int64ObservableGauge],
@@ -50,9 +50,11 @@ incrementally increase in value. UpDownCounters ([Int64UpDownCounter],
 values that can increase and decrease. When more information needs to be
 conveyed about all the synchronous measurements made during a collection cycle,
 a Histogram ([Int64Histogram] and [Float64Histogram]) should be used. Finally,
-when just the most recent measurement needs to be conveyed about an
-asynchronous measurement, a Gauge ([Int64ObservableGauge] and
-[Float64ObservableGauge]) should be used.
+when just the most recent measurement needs to be conveyed, a Gauge
+([Int64Gauge], [Float64Gauge], [Int64ObservableGauge], and
+[Float64ObservableGauge]) should be used: the synchronous variants record an
+instantaneous value at a specific point in code, while the observable variants
+sample the value via a callback once per collection cycle.
 
 See the [OpenTelemetry documentation] for more information about instruments
 and their intended use.
@@ -80,11 +82,11 @@ Measurements are made by recording values and information about the values with
 an instrument. How these measurements are recorded depends on the instrument.
 
 Measurements for synchronous instruments ([Int64Counter], [Int64UpDownCounter],
-[Int64Histogram], [Float64Counter], [Float64UpDownCounter], and
-[Float64Histogram]) are recorded using the instrument methods directly. All
-counter instruments have an Add method that is used to measure an increment
-value, and all histogram instruments have a Record method to measure a data
-point.
+[Int64Histogram], [Int64Gauge], [Float64Counter], [Float64UpDownCounter],
+[Float64Histogram], and [Float64Gauge]) are recorded using the instrument
+methods directly. All counter instruments have an Add method that is used to
+measure an increment value, and all histogram and synchronous gauge
+instruments have a Record method to measure a data point.
 
 Asynchronous instruments ([Int64ObservableCounter],
 [Int64ObservableUpDownCounter], [Int64ObservableGauge],