Adding a bit more info from the model documentation

src/epics/util/lib/Noise.pm

@@ -4,6 +4,10 @@ use Exporter;
 
 #//     \page Noise Noise.pm
 #//     Documentation for Noise.pm
+#//     This Noise part generates uniform random noise in the 
+#//     (0, 1) range. This block utilizes the pseudo-random number 
+#//     generator from page 342  (section 7.1) of the third edition 
+#//     of Numerical recipies. 
 #//
 #// \n