Correcting typos
diff --git a/examples/hook/hook.go b/examples/hook/hook.go
index 91b41ee..707a5bb 100644
--- a/examples/hook/hook.go
+++ b/examples/hook/hook.go
@@ -1,7 +1,7 @@
// +build ignore
-// Do NOT include the above line in your code. This is a build contrainst used
+// Do NOT include the above line in your code. This is a build constraint used
// to prevent import loops in the code whilst go get'ting it.
-// Read more about build contrains in golang here:
+// Read more about build constraints in golang here:
// https://golang.org/pkg/go/build/#hdr-Build_Constraints
package main
