A few extra notes in the comments.

src/ph.c

@@ -30,8 +30,8 @@
  * Perfect hashing based on universal hashing. See:
  * - Fredman, Komlos & Szemeredi (1984), JACM 31 (3)
  * - Thorup (2020), arxiv.org 1504.06804
- * and the Wikipedia articles "Universal Hashing" and "Perfect hash
- * function".
+ * This is the same theory behind the NH algorithm applied as part of UMAC
+ * message authentication, see RFC 4418 (esp section 5.2.2).
  */
 
 #include <stdlib.h>
@@ -87,7 +87,7 @@ struct bucket {
 
 /*
  * Multilinear-HM from Lemire & Kaser (2018), except that we add the tail
- * part. arxiv.org 1202.4961
+ * part and the length bounds. arxiv.org 1202.4961
  */
 static inline uint32_t
 hash(const struct hash * const restrict hash,