add docs about old way of specifying defaults

1 files changed, 11 insertions, 0 deletions

diff --git a/README.md b/README.md
index 0ad03bc..1f02559 100644
--- a/README.md
+++ b/README.md
@@ -148,6 +148,17 @@ var args struct {
 arg.MustParse(&args)
 ```
 
+### Default values (before v1.2)
+
+```go
+var args struct {
+	Foo string
+	Bar bool
+}
+arg.Foo = "abc"
+arg.MustParse(&args)
+```
+
 ### Arguments with multiple values
 ```go
 var args struct {