diff --git a/src/hash/maphash/maphash.go b/src/hash/maphash/maphash.go
index 3c0fc3628a..4fef88e8ee 100644
--- a/src/hash/maphash/maphash.go
+++ b/src/hash/maphash/maphash.go
@@ -5,7 +5,7 @@
 // Package maphash provides hash functions on byte sequences.
 // These hash functions are intended to be used to implement hash tables or
 // other data structures that need to map arbitrary strings or byte
-// sequences to a uniform distribution of integers.
+// sequences to a uniform distribution on unsigned 64-bit integers.
 //
 // The hash functions are collision-resistant but not cryptographically secure.
 // (See crypto/sha256 and crypto/sha512 for cryptographic use.)