diff --git a/scheme/interfaces.scm b/scheme/interfaces.scm
index 7286e60..b2de148 100644
--- a/scheme/interfaces.scm
+++ b/scheme/interfaces.scm
@@ -35,7 +35,10 @@
 
    ldap-count-references
    ldap-first-reference
-   ldap-next-reference))
+   ldap-next-reference
+
+   ldap-modify
+   ldap-add))
 
 (define-interface ldap-handle-types-interface
   (export
@@ -49,6 +52,10 @@
    ber-element?
 
    ldap-modification?
+   make-ldap-modification
+   ldap-modification-operator
+   ldap-modification-type
+   ldap-modification-value-list
 
    ldap-api-info?
    ldap-api-info-info-version
@@ -74,7 +81,6 @@
    set-ldap-message-session!
    ldap-message-result
    set-ldap-message-result!
-   ldap-modification-c-pointer
    ldap-api-info-c-pointer
    ber-element-c-pointer
    convert-ldap-return-code
@@ -107,6 +113,11 @@
    ldap-message-types-name
    (ldap-message-types :syntax)
 
+   ldap-operation-object?
+   ldap-operation-elements
+   ldap-operation-name
+   (ldap-operation :syntax)
+
    ldap-attributes-no-attribute
    ldap-attributes-all-user-attributes))
 
@@ -117,7 +128,8 @@
     ldap-scope-arguments-id
     ldap-session-option-value-id
     ldap-return-id
-    ldap-message-types-id)))
+    ldap-message-types-id
+    ldap-operation-id)))
 
 (define-interface ldap-types-interface
   (compound-interface