Index: trunk/ppImage/src/ppImageSetMaskBits.c
===================================================================
--- trunk/ppImage/src/ppImageSetMaskBits.c	(revision 23825)
+++ trunk/ppImage/src/ppImageSetMaskBits.c	(revision 24079)
@@ -14,7 +14,11 @@
     // at this point we know we have valid values for required entries SAT, BAD, FLAT, BLANK:
 
-    // mask for non-linear flat corrections
+    // mask for bad flat corrections
     options->flatMask = pmConfigMaskGet("FLAT", config);
     psAssert (options->flatMask, "flat mask not set");
+
+    // mask for bad dark corrections
+    options->darkMask = pmConfigMaskGet("DARK", config);
+    psAssert (options->darkMask, "dark mask not set");
 
     // mask for non-existent data  (default to DETECTOR if not defined)