Index: src/wherecode.c
==================================================================
--- src/wherecode.c
+++ src/wherecode.c
@@ -1689,11 +1689,11 @@
       if( pLoop->wsFlags & WHERE_IN_EARLYOUT ){
         sqlite3VdbeAddOp1(v, OP_SeekHit, iIdxCur);
       }
       if( regBignull ){
         sqlite3VdbeAddOp2(v, OP_Integer, 1, regBignull);
-        VdbeComment((v, "NULL-scan needed flag"));
+        VdbeComment((v, "NULL-scan pass ctr"));
       }
 
       op = aStartOp[(start_constraints<<2) + (startEq<<1) + bRev];
       assert( op!=0 );
       sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
@@ -1767,11 +1767,11 @@
     /* Check if the index cursor is past the end of the range. */
     if( nConstraint ){
       if( regBignull ){
         /* Except, skip the end-of-range check while doing the NULL-scan */
         sqlite3VdbeAddOp2(v, OP_IfNot, regBignull, sqlite3VdbeCurrentAddr(v)+3);
-        VdbeComment((v, "If NULL-scan active"));
+        VdbeComment((v, "If NULL-scan 2nd pass"));
         VdbeCoverage(v);
       }
       op = aEndOp[bRev*2 + endEq];
       sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
       testcase( op==OP_IdxGT );  VdbeCoverageIf(v, op==OP_IdxGT );
@@ -1784,11 +1784,11 @@
       ** the NULLs */
       assert( bSeekPastNull==!bStopAtNull );
       assert( bSeekPastNull+bStopAtNull==1 );
       assert( nConstraint+bSeekPastNull>0 );
       sqlite3VdbeAddOp2(v, OP_If, regBignull, sqlite3VdbeCurrentAddr(v)+2);
-      VdbeComment((v, "If NULL-scan pending"));
+      VdbeComment((v, "If NULL-scan 1st pass"));
       VdbeCoverage(v);
       op = aEndOp[bRev*2 + bSeekPastNull];
       sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase,
                            nConstraint+bSeekPastNull);
       testcase( op==OP_IdxGT );  VdbeCoverageIf(v, op==OP_IdxGT );