diff -ur man-pages-3.42.orig/man8/nscd.8 man-pages-3.42/man8/nscd.8
--- man-pages-3.42.orig/man8/nscd.8	2012-08-14 00:39:40.000000000 +0200
+++ man-pages-3.42/man8/nscd.8	2012-09-13 18:27:57.579018903 +0200
@@ -53,6 +53,8 @@
 Note that the shadow file is specifically not cached.
 .BR getspnam (3)
 calls remain uncached as a result.
+As a result of this behavior it is not possible to change non-nscd user 
+to another non-nscd user via su service when nscd is running. 
 .SH OPTIONS
 .TP
 .B "\-\-help"