Update docs_user/modules/con_key-manager-service-hsm-adoption-approaches.adoc

Co-authored-by: Katie Gilligan <[email protected]>

Author: mauricioharley

docs_user/modules/con_key-manager-service-hsm-adoption-approaches.adoc

@@ -37,6 +37,18 @@ HSM adoption requires additional configuration steps, including:
 * HSM client certificates and configuration files that are accessible by using URLs
 * Proper HSM partition and key configuration that matches your source environment
 
+These approaches are mutually exclusive. Choose an approach based on your source environment configuration.
+** nCipher (Entrust): PKCS#11 support available
+
+[IMPORTANT]
+====
+HSM adoption requires additional configuration steps, including:
+
+* Custom Barbican container images with HSM client libraries that are built using the `rhoso_proteccio_hsm` Ansible role
+* HSM client certificates and configuration files that are accessible by using URLs
+* Proper HSM partition and key configuration that matches your source environment
+* 
+
 These approaches are mutually exclusive. Choose an approach based on your source environment configuration.
 ====