diff --git a/src/microhttpd/mhd_str.c b/src/microhttpd/mhd_str.c
index 7c7fcf1f..822feccc 100644
--- a/src/microhttpd/mhd_str.c
+++ b/src/microhttpd/mhd_str.c
@@ -1146,7 +1146,7 @@ MHD_strx_to_uint64_n_ (const char *str,
  * @param base the numeric base, 10 or 16
  * @return non-zero number of characters processed on succeed,
  *         zero if no digit is found, resulting value is larger
- *         then @max_val, @val_size is not 16/32 or @a out_val is NULL
+ *         then @a max_val, @a val_size is not 4/8 or @a out_val is NULL
  */
 size_t
 MHD_str_to_uvalue_n_ (const char *str,
diff --git a/src/microhttpd/mhd_str.h b/src/microhttpd/mhd_str.h
index 2943cf27..09c63578 100644
--- a/src/microhttpd/mhd_str.h
+++ b/src/microhttpd/mhd_str.h
@@ -341,7 +341,7 @@ MHD_strx_to_uint64_n_ (const char *str,
  * @param base the numeric base, 10 or 16
  * @return non-zero number of characters processed on succeed,
  *         zero if no digit is found, resulting value is larger
- *         then @max_val, @val_size is not 16/32 or @a out_val is NULL
+ *         then @a max_val, @a val_size is not 4/8 or @a out_val is NULL
  */
 size_t
 MHD_str_to_uvalue_n_ (const char *str,
diff --git a/src/microhttpd/mhd_threads.c b/src/microhttpd/mhd_threads.c
index 96182965..45a10f12 100644
--- a/src/microhttpd/mhd_threads.c
+++ b/src/microhttpd/mhd_threads.c
@@ -179,7 +179,7 @@ MHD_set_thread_name_ (const MHD_thread_ID_ thread_id,
  * @param stack_size    size of stack for new thread, 0 for default
  * @param start_routine main function of thread
  * @param arg argument  for start_routine
- * @return non-zero on success; zero otherwise
+ * @return non-zero on success; zero otherwise (with errno set)
  */
 int
 MHD_create_thread_ (MHD_thread_handle_ID_ *thread,
diff --git a/src/microhttpd/mhd_threads.h b/src/microhttpd/mhd_threads.h
index 818cd5fa..0a504635 100644
--- a/src/microhttpd/mhd_threads.h
+++ b/src/microhttpd/mhd_threads.h
@@ -215,7 +215,7 @@ typedef MHD_THRD_RTRN_TYPE_
  * @param stack_size    size of stack for new thread, 0 for default
  * @param start_routine main function of thread
  * @param arg argument  for start_routine
- * @return non-zero on success; zero otherwise
+ * @return non-zero on success; zero otherwise (with errno set)
  */
 int
 MHD_create_thread_ (MHD_thread_handle_ID_ *thread,