diff --git a/doc/plugins/write/external.mdwn b/doc/plugins/write/external.mdwn
index e30bf2ff3..a3fbe8a2c 100644
--- a/doc/plugins/write/external.mdwn
+++ b/doc/plugins/write/external.mdwn
@@ -1,7 +1,7 @@
 External plugins are standalone, executable programs, that can be written
 in any language. When ikiwiki starts up, it runs the program, and
-communicates with it using [XML RPC][xmlrpc]. If you want to [[write]] an external
-plugin, read on..
+communicates with it using [XML RPC][xmlrpc]. If you want to [[write]] an
+external plugin, read on..
 
 [xmlrpc]: http://www.xmlrpc.com/
 
@@ -85,8 +85,8 @@ language as part of their XML RPC interface.
 
 XML RPC has a limitation that it does not have a way to pass
 undef/NULL/None. There is an extension to the protocol that supports this,
-but it is not yet available in the [[!cpan XML::RPC]] library used by
-ikiwiki.
+but it is not yet available in all versions of the [[!cpan XML::RPC]] library
+used by ikiwiki.
 
 Until the extension is available, ikiwiki allows undef to be communicated
 over XML RPC by passing a sentinal value, a hash with a single key "null"