diff --git a/README.txt b/README.txt
index 6eaa98ab6635e1ee7b262297d1b04d4af94dbdf3..6ed3a42981dc336c0419e848a23b77cd4d6fe3e8 100644
--- a/README.txt
+++ b/README.txt
@@ -8,5 +8,6 @@ This folder is organized as follows:
 * world_prop.v uses the aforementioned Coq library to construct the domain for Iris propositions
 * iris.v is the main file and contains the actual logic and the proof of the rules for view shifts and Hoare tiples
 
+Run "make" in this folder to build it all.
 Be aware that iris.v takes a long time to check and needs significant amounts of RAM!
 8GiB may be sufficient, but to be safe you should have 16GiB and give it around 2 to 3 hours.