diff --git a/package/mongrel2/mongrel2.mk b/package/mongrel2/mongrel2.mk
index 14e3a800e..23cec50e5 100644
--- a/package/mongrel2/mongrel2.mk
+++ b/package/mongrel2/mongrel2.mk
@@ -5,6 +5,8 @@
 ################################################################################
 
 MONGREL2_VERSION = v1.9.1
+# Do not use the github helper here, the generated tarball is *NOT* the same
+# as the one uploaded by upstream for the release.
 MONGREL2_SITE = https://github.com/zedshaw/mongrel2/releases/download/$(MONGREL2_VERSION)
 MONGREL2_LICENSE = BSD-3c
 MONGREL2_LICENSE_FILES = LICENSE