Alt text fix

Author: v-dirichards

articles/active-directory/saas-apps/proactis-rego-source-to-pay-tutorial.md

@@ -97,7 +97,7 @@ Complete the following steps to enable Azure AD single sign-on in the Azure port
 
  1. On the **Set up single sign-on with SAML** page, in the **SAML Signing Certificate** section, find **Certificate (PEM)** and select **Download** to download the certificate and save it on your computer.
 
-	![The Certificate download link](common/certificate-base64-download.png "Certificate")
+	![Screenshot of the Certificate download link.](common/certificate-base64-download.png "Certificate")
 
 1. On the **Set up Proactis Rego Source-to-Pay** section, copy the appropriate URL(s) based on your requirement.