diff --git a/src/runtime/mstats.go b/src/runtime/mstats.go
index 53caefc0fe..e6f2f0026b 100644
--- a/src/runtime/mstats.go
+++ b/src/runtime/mstats.go
@@ -262,7 +262,7 @@ type MemStats struct {
 	// can only be used for other objects of roughly the same
 	// size.
 	//
-	// HeapInuse minus HeapAlloc esimates the amount of memory
+	// HeapInuse minus HeapAlloc estimates the amount of memory
 	// that has been dedicated to particular size classes, but is
 	// not currently being used. This is an upper bound on
 	// fragmentation, but in general this memory can be reused