diff --git a/lib/notmuch.h b/lib/notmuch.h
index b40fa53d..0d9cb0f5 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -433,7 +433,7 @@ notmuch_query_search_messages (notmuch_query_t *query);
  *
  * This will in turn destroy any notmuch_threads_t and
  * notmuch_messages_t objects generated by this query, (and in
- * turn any notmuch_thrad_t and notmuch_message_t objects generated
+ * turn any notmuch_thread_t and notmuch_message_t objects generated
  * from those results, etc.), if such objects haven't already been
  * destroyed.
  */
@@ -571,7 +571,7 @@ notmuch_thread_get_subject (notmuch_thread_t *thread);
 time_t
 notmuch_thread_get_oldest_date (notmuch_thread_t *thread);
 
-/* Get the date of the oldest message in 'thread' as a time_t value.
+/* Get the date of the newest message in 'thread' as a time_t value.
  */
 time_t
 notmuch_thread_get_newest_date (notmuch_thread_t *thread);
@@ -924,7 +924,7 @@ notmuch_message_freeze (notmuch_message_t *message);
  * NOTMUCH_STATUS_SUCCESS: Message successfully thawed, (or at least
  *	its frozen count has successfully been reduced by 1).
  *
- * NOTMUCH_STATUS_UNBALANCE_FREEZE_THAW: An attempt was made to thaw
+ * NOTMUCH_STATUS_UNBALANCED_FREEZE_THAW: An attempt was made to thaw
  *	an unfrozen message. That is, there have been an unbalanced
  *	number of calls to notmuch_message_freeze and
  *	notmuch_message_thaw.