diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index aac78a1..160cb45 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -345,7 +345,6 @@
 
 msg "test/build: curves.pl (gcc)" # ~ 4 min
 cleanup
-cmake -D CMAKE_BUILD_TYPE:String=Debug .
 tests/scripts/curves.pl
 
 msg "test/build: depends-hashes.pl (gcc)" # ~ 2 min
@@ -354,7 +353,6 @@
 
 msg "test/build: key-exchanges (gcc)" # ~ 1 min
 cleanup
-cmake -D CMAKE_BUILD_TYPE:String=Check .
 tests/scripts/key-exchanges.pl
 
 msg "build: Unix make, -Os (gcc)" # ~ 30s
diff --git a/tests/scripts/curves.pl b/tests/scripts/curves.pl
index bd13f52..f4942c6 100755
--- a/tests/scripts/curves.pl
+++ b/tests/scripts/curves.pl
@@ -17,9 +17,12 @@
 #
 # And any test suite with the wrong dependencies will fail.
 #
-# Usage: curves.pl
+# Usage: tests/scripts/curves.pl
 #
 # This script should be executed from the root of the project directory.
+#
+# For best effect, run either with cmake disabled, or cmake enabled in a mode
+# that includes -Werror.
 
 use warnings;
 use strict;
diff --git a/tests/scripts/depends-hashes.pl b/tests/scripts/depends-hashes.pl
index 76e1b73..f27eb9e 100755
--- a/tests/scripts/depends-hashes.pl
+++ b/tests/scripts/depends-hashes.pl
@@ -20,6 +20,9 @@
 # Usage: tests/scripts/depends-hashes.pl
 #
 # This script should be executed from the root of the project directory.
+#
+# For best effect, run either with cmake disabled, or cmake enabled in a mode
+# that includes -Werror.
 
 use warnings;
 use strict;
diff --git a/tests/scripts/key-exchanges.pl b/tests/scripts/key-exchanges.pl
index 46826c3..528812a 100755
--- a/tests/scripts/key-exchanges.pl
+++ b/tests/scripts/key-exchanges.pl
@@ -1,8 +1,25 @@
 #!/usr/bin/perl
 
-# test that all configs with only a single key exchange enabled build
+# key-exchanges.pl
+#
+# Copyright (c) 2015-2017, ARM Limited, All Rights Reserved
+#
+# Purpose
+#
+# To test the code dependencies on individual key exchanges in the SSL module.
+# is a verification step to ensure we don't ship SSL code that do not work
+# for some build options.
+#
+# The process is:
+#       for each possible key exchange
+#           build the library with all but that key exchange disabled
 #
 # Usage: tests/scripts/key-exchanges.pl
+#
+# This script should be executed from the root of the project directory.
+#
+# For best effect, run either with cmake disabled, or cmake enabled in a mode
+# that includes -Werror.
 
 use warnings;
 use strict;