1 files changed, 2 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 6bc10e4..7b905bc 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,5 @@
+# Requires GNU make 3.80 or later
+
 VERSION := git-20171006
 
 all: sxiv