diff --git a/Doc/reference/ldap.rst b/Doc/reference/ldap.rst
index 585c34c..5d15158 100644
--- a/Doc/reference/ldap.rst
+++ b/Doc/reference/ldap.rst
@@ -697,6 +697,9 @@ and wait for and return with the server's result, or with
 
    *serverctrls* and *clientctrls* like described in section :ref:`ldap-controls`.
 
+   The *dn* argument, and mod_type (second item) of *modlist* are text strings;
+   see :ref:`bytes_mode`.
+
 
 .. py:method:: LDAPObject.bind(who, cred, method) -> int
 
@@ -738,6 +741,8 @@ and wait for and return with the server's result, or with
 
    *serverctrls* and *clientctrls* like described in section :ref:`ldap-controls`.
 
+   The *dn* and *attr* arguments are text strings; see :ref:`bytes_mode`.
+
    .. note::
 
       A design fault in the LDAP API prevents *value*
@@ -758,6 +763,8 @@ and wait for and return with the server's result, or with
 
    *serverctrls* and *clientctrls* like described in section :ref:`ldap-controls`.
 
+   The *dn* argument is text string; see :ref:`bytes_mode`.
+
 
 .. py:method:: LDAPObject.extop(extreq[,serverctrls=None[,clientctrls=None]]]) -> int
 
@@ -811,6 +818,9 @@ and wait for and return with the server's result, or with
    You might want to look into sub-module :py:mod:`ldap.modlist` for
    generating *modlist*.
 
+   The *dn* argument, and mod_type (second item) of *modlist* are text strings;
+   see :ref:`bytes_mode`.
+
 
 .. py:method:: LDAPObject.modrdn(dn, newrdn [, delold=1]) -> int
 
@@ -827,6 +837,8 @@ and wait for and return with the server's result, or with
    This operation is emulated by :py:meth:`rename()` and :py:meth:`rename_s()` methods
    since the modrdn2* routines in the C library are deprecated.
 
+   The *dn* and *newrdn* arguments are text strings; see :ref:`bytes_mode`.
+
 
 .. py:method:: LDAPObject.passwd(user, oldpw, newpw [, serverctrls=None [, clientctrls=None]]) -> int
 
@@ -845,6 +857,8 @@ and wait for and return with the server's result, or with
 
    The asynchronous version returns the initiated message id.
 
+   The *user*, *oldpw* and *newpw* arguments are text strings; see :ref:`bytes_mode`.
+
    .. seealso::
 
       :rfc:`3062` - LDAP Password Modify Extended Operation
@@ -866,6 +880,8 @@ and wait for and return with the server's result, or with
 
    *serverctrls* and *clientctrls* like described in section :ref:`ldap-controls`.
 
+   The *dn* and *newdn* arguments are text strings; see :ref:`bytes_mode`.
+
 
 .. py:method:: LDAPObject.result([msgid=RES_ANY [, all=1 [, timeout=None]]]) -> 2-tuple
 
@@ -1016,12 +1032,13 @@ and wait for and return with the server's result, or with
 
    *serverctrls* and *clientctrls* like described in section :ref:`ldap-controls`.
 
+   The *who* and *cred* arguments are text strings; see :ref:`bytes_mode`.
+
    .. versionchanged:: 3.0
 
       :meth:`~LDAPObject.simple_bind` and :meth:`~LDAPObject.simple_bind_s`
       now accept ``None`` for *who* and *cred*, too.
 
-
 .. py:method:: LDAPObject.search(base, scope [,filterstr='(objectClass=*)' [, attrlist=None [, attrsonly=0]]]) ->int
 
 .. py:method:: LDAPObject.search_s(base, scope [,filterstr='(objectClass=*)' [, attrlist=None [, attrsonly=0]]]) ->list|None
@@ -1074,6 +1091,9 @@ and wait for and return with the server's result, or with
    or :py:meth:`search_ext_s()` (client-side search limit). If non-zero
    not more than *sizelimit* results are returned by the server.
 
+   The *base* and *filterstr* arguments, and *attrlist* contents,
+   are text strings; see :ref:`bytes_mode`.
+
    .. versionchanged:: 3.0
 
       ``filterstr=None`` is equivalent to ``filterstr='(objectClass=*)'``.