diff --git a/build/tools/before_install.sh b/build/tools/before_install.sh
index 8c3f9d6ab2..541aafb95d 100755
--- a/build/tools/before_install.sh
+++ b/build/tools/before_install.sh
@@ -1,8 +1,8 @@
 #!/bin/sh
 #
-# This script is used by Travis CI to install the dependencies before building
-# wxWidgets but can also be run by hand if necessary but currently it only
-# works for Ubuntu versions used by Travis builds.
+# This script is used by both GitHub and Travis CI to install the dependencies
+# before building wxWidgets but can also be run by hand if necessary (but
+# currently it only works for Ubuntu versions used by the CI builds).
 
 set -e