1 files changed, 2 insertions, 0 deletions
diff --git a/os/kernel/src/chregistry.c b/os/kernel/src/chregistry.c
index 186d97e35..b02d5f1fb 100644
--- a/os/kernel/src/chregistry.c
+++ b/os/kernel/src/chregistry.c
@@ -33,6 +33,8 @@
  *          the main thread unless it terminated.
  * @note    A reference is added to the returned thread in order to make sure
  *          it status is not lost.
+ * @note    This function cannot return @p NULL because there is always at
+ *          least one thread in the system.
  *
  * @return  A reference to the first thread.
  */