Index: trunk/FACT++/src/Fits.cc
===================================================================
--- trunk/FACT++/src/Fits.cc	(revision 12687)
+++ trunk/FACT++/src/Fits.cc	(revision 12688)
@@ -243,5 +243,6 @@
         !fFile->WriteKeyNT("TSTOPF",   0, "Time when last event received (fractional part)")  ||
         !fFile->WriteKeyNT("DATE-OBS", 0, "Time when first event received") ||
-        !fFile->WriteKeyNT("DATE-END", 0, "Time when last event received"))
+        !fFile->WriteKeyNT("DATE-END", 0, "Time when last event received") ||
+        !fFile->WriteKeyNT("RUNNUM", fRunNumber, "Run number. 0 means not run file"))
         return false;