diff --git a/prand.h b/prand.h
index 3a4ad78..3be5e13 100644
--- a/prand.h
+++ b/prand.h
@@ -4,6 +4,9 @@
 /*
  * This is a PRNG for non-cryptographic use. May be used on micros given that
  * the seed is periodically saved to EEPROM or flash.
+ *
+ * See:
+ *      https://en.wikipedia.org/wiki/Linear_congruential_generator
  */
 
 /**