diff --git a/src/id/advent.a b/src/id/advent.a
index a1894b5..e44b8f0 100644
--- a/src/id/advent.a
+++ b/src/id/advent.a
@@ -9,6 +9,11 @@
 ;      all registers clobbered
 ;
 ; module by qkumba
+;
+; tested on
+; - Borrowed Time
+; - Mindshadow
+; - The Tracer Sanction
 ;-------------------------------
 IDAdvent
          lda   #BASEPAGE
diff --git a/src/id/dinkeydos.a b/src/id/dinkeydos.a
index bf1eba5..1084a59 100644
--- a/src/id/dinkeydos.a
+++ b/src/id/dinkeydos.a
@@ -15,5 +15,6 @@ IDDinkeyDOS
          ldy   #$0B
          jsr   compare    ; if T00,S0B,$2B ==
          !byte $29,$44,$49,$4E,$4B,$45,$59,$44,$4F,$53,$00
+                          ; passport-test-suite/Ultima V.woz [C=0] matches
          rts
 }
diff --git a/src/id/diversidos.a b/src/id/diversidos.a
index 50d9e29..cf86ff2 100644
--- a/src/id/diversidos.a
+++ b/src/id/diversidos.a
@@ -17,5 +17,6 @@ IDDiversi
          ldy   #$0B
          jsr   compare    ; if T00,S00,$F1 ==
          !byte $B3,$A3,$A0,$D2,$CF,$D2,$D2,$C5,$8D,$87,$8D
+                          ; passport-test-suite/Moon Bingo.woz [C=0] matches
          rts
 }
diff --git a/src/id/dos33.a b/src/id/dos33.a
index f645d90..83fde89 100755
--- a/src/id/dos33.a
+++ b/src/id/dos33.a
@@ -21,12 +21,15 @@ IDDOS33
 ;
          lda   $08FE
          cmp   #$B6
+                          ; passport-test-suite/Binomial Multiplication.woz [Z=1] here, loads at $B600
          beq   ++
          cmp   #$37
+                          ; passport-test-suite/Beach-Head.woz [C=0] here, loads at $3F00
          bcc   +
 -        sec
          rts
 +        cmp   #$20
+                          ; passport-test-suite/Alf.woz [C=0] here, loads at $1300
          bcc   -
 ;
 ; Code at $0801 must be standard (with one exception)
@@ -66,14 +69,12 @@ IDDOS33
          !byte $6C,$3E,$00
          !byte $EE,$FE,$08
          !byte $EE,$FE,$08
+                          ; passport-test-suite/Binomial Multiplication.woz [C=0] matches
          bcc   +
          jmp   .exit
 +
 ;
 ; DOS 3.3 has JSR $FE89 / JSR $FE93 / JSR $FB2F
-; some Sierra have STA $C050 / STA $C057 / STA $C055 instead
-; with the unpleasant side-effect of showing text-mode garbage
-; if mixed-mode was enabled at the time
 ;
          lda   #$00
          ldx   #$3F
@@ -83,7 +84,11 @@ IDDOS33
          !byte $20,$93,$FE
          !byte $20,$2F,$FB
          !byte $A6,$2B
+                          ; passport-test-suite/Binomial Multiplication.woz [C=0] matches
          bcc   +
+;
+; some Sierra have STA $C050 / STA $C057 / STA $C055 instead
+;
          lda   #$00
          ldx   #$3F
          ldy   #$0B
@@ -92,6 +97,8 @@ IDDOS33
          !byte $8D,$57,$C0
          !byte $8D,$55,$C0
          !byte $A6,$2B
+         bcs   .exit
+                          ; passport-test-suite/Leisure Suit Larry.woz [C=0] matches
 +
 
 ;
@@ -103,7 +110,9 @@ IDDOS33
          jsr   compare    ; if T00,S00,$4D ==
          !byte $00,$0D,$0B,$09,$07,$05,$03,$01
          !byte WILDCARD,$0C,$0A,$08,$06,$04,$02,$0F
+                          ; passport-test-suite/Pitfall II.woz [C=1] because of non-standard sector map
          bcs   .exit
+
 ;
 ; Check for MUSE sector order map
 ;
@@ -113,6 +122,7 @@ IDDOS33
          jsr   compare    ; if T00,S00,$55 ==
          !byte $02
          bcs   +
+                          ; passport-test-suite/The Function Game.woz [C=0] matches
          lda   #TRUE
          sta   gIsMUSERWTS
          lda   #$0E
@@ -122,15 +132,15 @@ IDDOS33
          sta   T00S0F
 +
 ;
-; Minor variant (e.g. Terrapin Logo 3.0) jumps to $08F0 and back
-; but is still safe to trace. Check for this jump and match
-; the code at $08F0 exactly.
+; Minor variant jumps to $08F0 and back but is still safe to trace.
+; Check for this jump and match the code at $08F0 exactly.
 ;
          lda   #$00
          ldx   #$1C
          ldy   #$03
          jsr   compare    ; if T00,S00,$1C ==
          !byte $8D,$FE,$08
+                          ; passport-test-suite/Binomial Multiplication.woz [C=0] matches
          bcc   .exit      ; standard code at $081C -> success
 
          lda   #$00
@@ -147,6 +157,7 @@ IDDOS33
          !byte $8D,$FE,$08
          !byte $EE,$F3,$03
          !byte $4C,$1F,$08
+                          ; passport-test-suite/Library Magic.woz [C=0] matches acceptable code at $08F0
 ;        bcs   .exit      ; unknown code at $08F0 -> failure
 
 .exit