diff --git a/README.md b/README.md
index 18e572d..18dc556 100644
--- a/README.md
+++ b/README.md
@@ -122,6 +122,9 @@ Options:
   --help, -h               print this help message
 ```
 
+As the example above shows, the `help` tag can be used in conjunction with `arg`, or instead. When used
+together, they can appear in either order.
+
 ### Default values
 
 ```go
@@ -322,4 +325,4 @@ The main idea behind `go-arg` is that Go already has an excellent way to describ
 
 ### Backward Compatibility Notes
 
-The tags have changed recently. Earlier versions required the help text to be part of the `arg` tag. This is still supported but is now deprecated. Instead, you should use a separate `help` tag, described above, which removes most of the limits on the text you can write.
+The tags have changed recently. Earlier versions required the help text to be part of the `arg` tag. This is still supported but is now deprecated. Instead, you should use a separate `help` tag, described above, which removes most of the limits on the text you can write. In particular, you will need to use the new `help` tag if your help text includes any commas.
diff --git a/usage_test.go b/usage_test.go
index bdf4ea2..940bf40 100644
--- a/usage_test.go
+++ b/usage_test.go
@@ -65,13 +65,13 @@ func TestUsageLongPositionalWithHelp_legacyForm(t *testing.T) {
 
 Positional arguments:
   VERYLONGPOSITIONALWITHHELP
-                         this positional argument is very long
+                         this positional argument is very long but cannot include commas
 
 Options:
   --help, -h             display this help and exit
 `
 	var args struct {
-		VeryLongPositionalWithHelp string `arg:"positional,help:this positional argument is very long"`
+		VeryLongPositionalWithHelp string `arg:"positional,help:this positional argument is very long but cannot include commas"`
 	}
 
 	p, err := NewParser(Config{}, &args)
@@ -88,13 +88,13 @@ func TestUsageLongPositionalWithHelp_newForm(t *testing.T) {
 
 Positional arguments:
   VERYLONGPOSITIONALWITHHELP
-                         this positional argument is very long
+                         this positional argument is very long, and includes: commas, colons etc
 
 Options:
   --help, -h             display this help and exit
 `
 	var args struct {
-		VeryLongPositionalWithHelp string `arg:"positional" help:"this positional argument is very long"`
+		VeryLongPositionalWithHelp string `arg:"positional" help:"this positional argument is very long, and includes: commas, colons etc"`
 	}
 
 	p, err := NewParser(Config{}, &args)