diff --git a/Source/Fortran/makefile_cray b/Source/Fortran/makefile_cray
index 444892b79b2273ef420ea70117e3b784f70c22bf..69ded5e747604048b0e849b9c9feb6d5393af590 100644
--- a/Source/Fortran/makefile_cray
+++ b/Source/Fortran/makefile_cray
@@ -7,7 +7,7 @@
 # SPDX-License-Identifier: GPL-2.0 
 # 
 # Version for a machine with eccodes and emoslib installed on standard paths
-# full debugging
+# with optimisation
 #
 ###############################################################################
 
diff --git a/Source/Fortran/makefile_ecgate b/Source/Fortran/makefile_ecgate
index b3cd85cfe93058b69e3ba0d1dce1049322498be4..e68960f32d10fda286914789e297dc5812791b56 100644
--- a/Source/Fortran/makefile_ecgate
+++ b/Source/Fortran/makefile_ecgate
@@ -7,7 +7,7 @@
 # SPDX-License-Identifier: GPL-2.0 
 # 
 # Version for a machine with eccodes and emoslib installed on standard paths
-# full debugging
+# with optimisation
 #
 ###############################################################################
 
diff --git a/Source/Fortran/makefile_fast b/Source/Fortran/makefile_fast
index 49b35c41ffd3d200fbf26cd70e35e0c61146619a..a9f6bbfca6dc07a0a83320f84f1e82c38d0e3b22 100644
--- a/Source/Fortran/makefile_fast
+++ b/Source/Fortran/makefile_fast
@@ -7,7 +7,7 @@
 # SPDX-License-Identifier: GPL-2.0 
 # 
 # Version for a machine with eccodes and emoslib installed on standard paths
-# full debugging
+# with optimisation
 #
 ###############################################################################