diff --git a/tags.txt b/tags.txt
index 9441b69..3232a41 100644
--- a/tags.txt
+++ b/tags.txt
@@ -8,6 +8,7 @@ These tags should be defined at the top of the file with some comment, a la:
 This is the list of currently defined tags:
 - STATIC: Contains static libraries
 - PATHS: Uses sed scripts or other hacks to fix hardcoded paths
+- DOWNLOAD: Needs an internet connection during build
 - BIN: Includes pre-compiled binaries
 - FLAGS: Doesn't respect one or more *FLAGS variables
 - PATCH: Requires a patch to build correctly