Fix typo
diff --git a/viper.go b/viper.go
index 7a49a0a..70f8d03 100644
--- a/viper.go
+++ b/viper.go
@@ -540,7 +540,7 @@
 	return cast.ToString(v.Get(key))
 }
 
-// Returns the value associated with the key asa boolean
+// Returns the value associated with the key as a boolean
 func GetBool(key string) bool { return v.GetBool(key) }
 func (v *Viper) GetBool(key string) bool {
 	return cast.ToBool(v.Get(key))