diff --git a/src/constants.a b/src/constants.a
index bb59bf3..c4d425a 100644
--- a/src/constants.a
+++ b/src/constants.a
@@ -1,5 +1,5 @@
 ;license:MIT
-;(c) 2020 by 4am
+;(c) 2020-2 by 4am
 ;
 
 ;------------------------------------------------------------------------------
diff --git a/src/glue.sound.a b/src/glue.sound.a
index 85d9cea..a6df372 100644
--- a/src/glue.sound.a
+++ b/src/glue.sound.a
@@ -1,3 +1,5 @@
+;license:MIT
+;(c) 2020-2 by 4am
 ;
 ; convenience functions for playing sounds through different libraries
 ;
diff --git a/src/hw.accel.a b/src/hw.accel.a
index 1b55f4f..6d2a89e 100644
--- a/src/hw.accel.a
+++ b/src/hw.accel.a
@@ -6,12 +6,6 @@
 ;
 ; Forked from NORMFAST Release 6 (see changelog below)
 ;
-; For Total Replay, we split the machine identification code from
-; the (de)acceleration code, because we can do the ID part once
-; at program startup (when ROM is easily available), then
-; (de)accelerate repeatedly from the language card (when ROM
-; is switched out).
-;
 ; --------------------------------------------------------------
 ;
 ; Original changelog and documentation:
diff --git a/src/million.a b/src/million.a
index 6871fa1..d9b5de0 100644
--- a/src/million.a
+++ b/src/million.a
@@ -1,5 +1,5 @@
 ;license:MIT
-;(c) 2020 by 4am
+;(c) 2020-2 by 4am
 ;
 ; /!\ Both sound libraries (electric.duet.a and mockingduet.a) are licensed under the
 ;     GPL (2+ and 3+, respectively), so the program as a whole is licensed GPL 3+ by
diff --git a/src/storage.a b/src/storage.a
index 5e53099..ef7db63 100644
--- a/src/storage.a
+++ b/src/storage.a
@@ -1,5 +1,5 @@
 ;license:MIT
-;(c) 2020 by 4am
+;(c) 2020-2 by 4am
 ;
 ; disk functions to load puzzles, and load & save puzzle completion status
 ;
diff --git a/src/ui.demo.a b/src/ui.demo.a
index 03ef05b..00b80f6 100644
--- a/src/ui.demo.a
+++ b/src/ui.demo.a
@@ -1,5 +1,5 @@
 ;license:MIT
-;(c) 2020 by 4am
+;(c) 2020-2 by 4am
 ;
 ; self-running demo
 ;
diff --git a/src/ui.help.a b/src/ui.help.a
index 32da28f..3ac1d2c 100644
--- a/src/ui.help.a
+++ b/src/ui.help.a
@@ -1,5 +1,5 @@
 ;license:MIT
-;(c) 2020 by 4am
+;(c) 2020-2 by 4am
 ;
 ; display help screen
 ;
diff --git a/src/ui.main.menu.a b/src/ui.main.menu.a
index 92890fa..0ce2432 100644
--- a/src/ui.main.menu.a
+++ b/src/ui.main.menu.a
@@ -1,5 +1,5 @@
 ;license:MIT
-;(c) 2020 by 4am
+;(c) 2020-2 by 4am
 ;
 ; main menu
 ;
diff --git a/src/ui.play.a b/src/ui.play.a
index 57ed5a4..53711dd 100644
--- a/src/ui.play.a
+++ b/src/ui.play.a
@@ -1,5 +1,5 @@
 ;license:MIT
-;(c) 2020 by 4am
+;(c) 2020-2 by 4am
 ;
 ; main event loop for playing puzzles
 ;
diff --git a/src/ui.select.world.a b/src/ui.select.world.a
index 64251e4..8cac938 100644
--- a/src/ui.select.world.a
+++ b/src/ui.select.world.a
@@ -1,5 +1,5 @@
 ;license:MIT
-;(c) 2020 by 4am
+;(c) 2020-2 by 4am
 ;
 ; select world screen
 ;
diff --git a/src/ui.strings.a b/src/ui.strings.a
index 93ea24f..cce3d4e 100644
--- a/src/ui.strings.a
+++ b/src/ui.strings.a
@@ -1,5 +1,5 @@
 ;license:MIT
-;(c) 2020 by 4am
+;(c) 2020-2 by 4am
 ;
 
 sTitleLine1
@@ -13,7 +13,7 @@ sTitleLine3
          !raw "LETTERS"
 sVersion
          !byte 4
-         !raw  "V0.6"
+         !raw  "V1.0"
 sOneSpace
          !byte 1
          !raw  " "
@@ -152,7 +152,7 @@ sHelpSound
          !raw  "CTRL-S......................TOGGLE SOUND"
 sHelpQuit
          !byte 40
-         !raw  "ESC............................MAIN MENU"
+         !raw  "ESC.................BACK TO SELECT LEVEL"
 sProgress10
          !byte 25
          !raw "10% COMPLETE! KEEP IT UP!"
diff --git a/src/unused.a b/src/unused.a
deleted file mode 100644
index 8bde45f..0000000
--- a/src/unused.a
+++ /dev/null
@@ -1,17 +0,0 @@
-;------------------------------------------------------------------------------
-; HasPuzzleBeenCompleted
-;
-; in:    X = puzzle ID
-; out:   C clear if puzzle had previously been marked as completed
-;        C set if puzzle has never been marked as completed
-;        X/Y preserved
-;        A clobbered
-;        other flags clobbered
-;------------------------------------------------------------------------------
-HasPuzzleBeenCompleted
-         lda   PROGRESS, x
-         beq   +
-         clc
-         rts
-+        sec
-         rts