Index: trunk/Ohana/src/libfits/matrix/F_compress_M.c
===================================================================
--- trunk/Ohana/src/libfits/matrix/F_compress_M.c	(revision 37039)
+++ trunk/Ohana/src/libfits/matrix/F_compress_M.c	(revision 37054)
@@ -58,4 +58,5 @@
 
   // is ZIMAGE present?
+  // NOTE target of %t must be int length
   status = gfits_scan_alt (ftable->header, "ZIMAGE", "%t", 1, &zimage);
   if (!status || !zimage) ESCAPE;
@@ -125,4 +126,5 @@
   int have_ztension;
 
+  // NOTE target of %t must be int length
   have_zsimple  = gfits_scan_alt (header, "ZSIMPLE", "%t", 1, &zsimple);
   have_ztension = gfits_scan (header, "ZTENSION", "%s", 1, exttype);