diff --git a/doc/man/man1/ldapsearch.1 b/doc/man/man1/ldapsearch.1
index 8793180620..d7b82a0366 100644
--- a/doc/man/man1/ldapsearch.1
+++ b/doc/man/man1/ldapsearch.1
@@ -193,6 +193,9 @@ or
 to specify a base object, one-level, subtree, or children search.
 The default is
 .IR sub .
+Note:
+.I children
+scope requires LDAPv3 subordinate feature extension.
 .TP
 .BI \-a \ never\fR\||\|\fIalways\fR\||\|\fIsearch\fR\||\|\fIfind
 Specify how aliases dereferencing is done.  Should be one of