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-rw-r--r--install-win32/macro.pl7
1 files changed, 7 insertions, 0 deletions
diff --git a/install-win32/macro.pl b/install-win32/macro.pl
index e3a7f30..6e7afdc 100644
--- a/install-win32/macro.pl
+++ b/install-win32/macro.pl
@@ -1,3 +1,10 @@
+# Simple macro processor.
+
+# Macros are defined in a control file that follows
+# NSIS format such as version.nsi. Stdin is then
+# copied to stdout, and any occurrence of @@MACRO@@ is
+# substituted.
+
die "usage: macro.pl <control-file>" if (@ARGV < 1);
($control_file) = @ARGV;