diff --git a/src/backend/lib/dshash.c b/src/backend/lib/dshash.c
index cc49b4ca51..ab30f29eee 100644
--- a/src/backend/lib/dshash.c
+++ b/src/backend/lib/dshash.c
@@ -202,7 +202,7 @@ static inline void copy_key(dshash_table *hash_table, void *dest,
  * Create a new hash table backed by the given dynamic shared area, with the
  * given parameters.  The returned object is allocated in backend-local memory
  * using the current MemoryContext.  'arg' will be passed through to the
- * compare and hash functions.
+ * compare, hash, and copy functions.
  */
 dshash_table *
 dshash_create(dsa_area *area, const dshash_parameters *params, void *arg)
diff --git a/src/include/lib/dshash.h b/src/include/lib/dshash.h
index 2ff1ba6c24..7dda269b75 100644
--- a/src/include/lib/dshash.h
+++ b/src/include/lib/dshash.h
@@ -43,15 +43,13 @@ typedef void (*dshash_copy_function) (void *dest, const void *src, size_t size,
 
 /*
  * The set of parameters needed to create or attach to a hash table.  The
- * members tranche_id and tranche_name do not need to be initialized when
- * attaching to an existing hash table.
+ * tranche_id member does not need to be initialized when attaching to an
+ * existing hash table.
  *
- * Compare and hash functions must be supplied even when attaching, because we
- * can't safely share function pointers between backends in general.  Either
- * the arg variants or the non-arg variants should be supplied; the other
- * function pointers should be NULL.  If the arg variants are supplied then the
- * user data pointer supplied to the create and attach functions will be
- * passed to the hash and compare functions.
+ * Compare, hash, and copy functions must be supplied even when attaching,
+ * because we can't safely share function pointers between backends in general.
+ * The user data pointer supplied to the create and attach functions will be
+ * passed to these functions.
  */
 typedef struct dshash_parameters
 {