document some undocumented Makefile.PL parameters

diff --git a/Makefile.PL b/Makefile.PL
index 291a58c5262570ccec2b5bd68cecc59c6efd83ec..327c2a991906f6dcd13e5c5533e18813dcc43846 100644 (file)
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -944,6 +944,12 @@ Other options:
     Add to the include search path
   --libpath dir
     Add to the library search path
+  --coverage
+    Build for coverage testing.
+  --assert
+    Build with assertions active.
+  --noexif
+    Disable EXIF parsing.
 EOS
   exit 1;