diff --git a/INSTALLATION.txt b/INSTALLATION.txt
index c2a4c64e2884ca4d0099b4a17885b86607231a8d..96d1e93e654d1574af5018d7cc88cf0c1a80abc1 100644
--- a/INSTALLATION.txt
+++ b/INSTALLATION.txt
@@ -51,5 +51,6 @@ futils:
 
 Compilation of HeLaZ
 1. ensure that HeLaZ/local/dirs.inc contains the right paths to the librairies (Be careful of fftw name)
-2. make
+2. make install
 3. (TODO: test script for installation check)
+4. next times, for compilation, make is sufficient