diff --git a/card.io/src/main/java/io/card/payment/CardIOActivity.java b/card.io/src/main/java/io/card/payment/CardIOActivity.java
index 9197b74e..cf9dc9a3 100644
--- a/card.io/src/main/java/io/card/payment/CardIOActivity.java
+++ b/card.io/src/main/java/io/card/payment/CardIOActivity.java
@@ -90,8 +90,8 @@ public final class CardIOActivity extends Activity {
 
     /**
      * Boolean extra. Optional. Defaults to <code>false</code>. If set, the postal code will only collect numeric
-     * input. Set this is you know the <a href="https://en.wikipedia.org/wiki/Postal_code">expected country</a>
-     * has only numeric postal codes.
+     * input. Set this if you know the <a href="https://en.wikipedia.org/wiki/Postal_code">expected country's
+     * postal code</a> has only numeric postal codes.
      */
     public static final String EXTRA_RESTRICT_POSTAL_CODE_TO_NUMERIC_ONLY = "io.card.payment.restrictPostalCodeToNumericOnly";