diff --git a/sdk/metric/reader.go b/sdk/metric/reader.go
index a55f9a537..d94bdee75 100644
--- a/sdk/metric/reader.go
+++ b/sdk/metric/reader.go
@@ -34,7 +34,7 @@ var errNonPositiveDuration = fmt.Errorf("non-positive duration")
 // start of bi-directional control flow.
 //
 // Typically, push-based exporters that are periodic will
-// implement PeroidicExporter themselves and construct a
+// implement PeriodicExporter themselves and construct a
 // PeriodicReader to satisfy this interface.
 //
 // Pull-based exporters will typically implement Register