diff --git a/Controller/CustomerReturn/Index.php b/Controller/CustomerReturn/Index.php
index 89c1200..187d183 100644
--- a/Controller/CustomerReturn/Index.php
+++ b/Controller/CustomerReturn/Index.php
@@ -3,7 +3,7 @@
 /**
  * 2017-11-07
  * Note 1.
- * Stripe API documentaion → «3D Secure Card Payments with Sources» →
+ * Stripe API documentation → «3D Secure Card Payments with Sources» →
  * «Step 4: Have the customer complete 3D Secure verification».
  *
  * «Once you determine if the card supports or requires 3D Secure,
@@ -58,7 +58,7 @@ class Index extends \Df\Payment\CustomerReturn {
 	 * https://stripe.com/docs/sources/three-d-secure#customer-action
 	 * Note 4.
 	 * I treat the `pending` status as a successfull one because of this:
-	 * «Stripe API documentaion → «3D Secure Card Payments with Sources» → «Step 5: Charge the Source».
+	 * «Stripe API documentation → «3D Secure Card Payments with Sources» → «Step 5: Charge the Source».
 	 * Once the customer has authenticated the payment,
 	 * the source’s `status` transitions to `chargeable` and it can be used to make a charge request.
 	 * This transition happens asynchronously
diff --git a/Init/Action.php b/Init/Action.php
index 600a62e..46c124e 100644
--- a/Init/Action.php
+++ b/Init/Action.php
@@ -115,7 +115,7 @@ protected function redirectUrl() {return dfc($this, function() {
 			 * and we have already handled it above.
 			 *
 			 * 2017-11-07
-			 * Stripe API documentaion → «3D Secure Card Payments with Sources» →
+			 * Stripe API documentation → «3D Secure Card Payments with Sources» →
 			 * «Step 3: Create a 3D Secure Source object» → «Checking if verification is still required».
 			 *
 			 * *) When creating a 3D Secure source,
@@ -189,7 +189,7 @@ protected function transId() {return !$this->redirectUrl() ? null : $this->e2i(
 
 	/**
 	 * 2017-11-06
-	 * Stripe API documentaion → «3D Secure Card Payments with Sources» →
+	 * Stripe API documentation → «3D Secure Card Payments with Sources» →
 	 * «Step 2: Determine if the card supports or requires 3D Secure».
 	 * «The behavior of, and support for, 3D Secure can vary across card networks and types.
 	 * *) For cards that are not supported, perform a regular card payment instead.
@@ -209,6 +209,11 @@ protected function transId() {return !$this->redirectUrl() ? null : $this->e2i(
 	 * 		The process must be completed for a charge to be successful.
 	 * »
 	 * https://stripe.com/docs/sources/three-d-secure#check-requirement
+	 *
+	 * 2017-11-14
+	 * My answer to the "Stripe: How do i know whether card is 3d secure and how to charge it" question
+	 * on Stack Overflow: https://stackoverflow.com/a/47276816
+	 *
 	 * @used-by source3DS()
 	 * @return bool
 	 */