diff --git a/scst/include/backport.h b/scst/include/backport.h
index 816da4c41..638e57e35 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -296,6 +296,10 @@ static inline void hex2bin(u8 *dst, const char *src, size_t count)
 }
 #endif
 
+/*
+ * See also commit 33ee3b2e2eb9. That commit was introduced in kernel v2.6.39
+ * and later backported to kernel v2.6.38.4.
+ */
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39) &&		\
 	LINUX_VERSION_CODE != KERNEL_VERSION(2, 6, 38) &&	\
 	(!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 6)