diff --git a/dlls/kernel/thunk.c b/dlls/kernel/thunk.c
index f4f101c5e3d..91e823e9061 100644
--- a/dlls/kernel/thunk.c
+++ b/dlls/kernel/thunk.c
@@ -1930,6 +1930,10 @@ BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
 
 /**********************************************************************
  *		_KERNEL32_99
+ *
+ * Checks whether the clock has to be switched from daylight
+ * savings time to standard time or vice versa.
+ *
  */
 DWORD WINAPI _KERNEL32_99(DWORD x)
 {