cop.h: Clarify comment

diff --git a/cop.h b/cop.h
index 9f3762e..af98965 100644 (file)
--- a/cop.h
+++ b/cop.h
@@ -387,7 +387,8 @@ struct cop {
     line_t      cop_line;       /* line # of this command */
     /* label for this construct is now stored in cop_hints_hash */
 #ifdef USE_ITHREADS
-    PADOFFSET  cop_stashoff;   /* package line was compiled in */
+    PADOFFSET  cop_stashoff;   /* offset into PL_stashpad, for the
+                                  package the line was compiled in */
     char *     cop_file;       /* file name the following line # is from */
 #else
     HV *       cop_stash;      /* package line was compiled in */