diff --git a/CHANGELOG.md b/CHANGELOG.md
index 04571604..53d0bf39 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -64,14 +64,16 @@
 * Support for OSC-176, _"Set App-ID"_
   (https://gist.github.com/delthas/d451e2cc1573bb2364839849c7117239).
 * Support for `DECRQM` queries with ANSI/ECMA-48 modes (`CSI Ps $ p`).
+* `DECRQM` queries for private mode 67 ([`DECBKM`]) now reply with mode
+  value 4 ("permanently reset") instead of 0 ("not recognized").
 * Rectangular edit functions: `DECCARA`, `DECRARA`, `DECCRA`, `DECFRA`
   and `DECERA` ([#1633][1633]).
 * `Rect` capability to terminfo.
 
 [1348]: https://codeberg.org/dnkl/foot/issues/1348
 [1633]: https://codeberg.org/dnkl/foot/issues/1633
-
 [1564]: https://codeberg.org/dnkl/foot/pulls/1564
+[`DECBKM`]: https://vt100.net/docs/vt510-rm/DECBKM.html
 
 ### Changed
 
diff --git a/README.md b/README.md
index b8d67e96..eb7fe81c 100644
--- a/README.md
+++ b/README.md
@@ -428,13 +428,13 @@ mode_, `\E[?1034l`), and enabled again with `smm` (_set meta mode_,
 ## Backspace
 
 Foot transmits DEL (`^?`) on <kbd>backspace</kbd>. This corresponds to
-XTerm's `backarrowKey` option set to `false`, and to DECBKM being
-_reset_.
+XTerm's `backarrowKey` option set to `false`, and to
+[`DECBKM`](https://vt100.net/docs/vt510-rm/DECBKM.html) being _reset_.
 
 To instead transmit BS (`^H`), press
 <kbd>ctrl</kbd>+<kbd>backspace</kbd>.
 
-Note that foot does **not** implement DECBKM, and that the behavior
+Note that foot does **not** implement `DECBKM`, and that the behavior
 described above **cannot** be changed.
 
 Finally, pressing <kbd>alt</kbd> will prefix the transmitted byte with
diff --git a/csi.c b/csi.c
index 0d1ee1f4..04777310 100644
--- a/csi.c
+++ b/csi.c
@@ -324,6 +324,11 @@ decset_decrst(struct terminal *term, unsigned param, bool enable)
         term->keypad_keys_mode = enable ? KEYPAD_APPLICATION : KEYPAD_NUMERICAL;
         break;
 
+    case 67:
+        if (enable)
+            LOG_WARN("unimplemented: DECBKM");
+        break;
+
     case 80:
         term->sixel.scrolling = !enable;
         break;
@@ -555,6 +560,7 @@ decrqm(const struct terminal *term, unsigned param)
     case 25: return decrpm(!term->hide_cursor);
     case 45: return decrpm(term->reverse_wrap);
     case 66: return decrpm(term->keypad_keys_mode == KEYPAD_APPLICATION);
+    case 67: return DECRPM_PERMANENTLY_RESET; /* https://vt100.net/docs/vt510-rm/DECBKM */
     case 80: return decrpm(!term->sixel.scrolling);
     case 1000: return decrpm(term->mouse_tracking == MOUSE_CLICK);
     case 1001: return DECRPM_PERMANENTLY_RESET;
@@ -600,6 +606,7 @@ xtsave(struct terminal *term, unsigned param)
     case 45: term->xtsave.reverse_wrap = term->reverse_wrap; break;
     case 47: term->xtsave.alt_screen = term->grid == &term->alt; break;
     case 66: term->xtsave.application_keypad_keys = term->keypad_keys_mode == KEYPAD_APPLICATION; break;
+    case 67: break;
     case 80: term->xtsave.sixel_display_mode = !term->sixel.scrolling; break;
     case 1000: term->xtsave.mouse_click = term->mouse_tracking == MOUSE_CLICK; break;
     case 1001: break;
@@ -642,6 +649,7 @@ xtrestore(struct terminal *term, unsigned param)
     case 45: enable = term->xtsave.reverse_wrap; break;
     case 47: enable = term->xtsave.alt_screen; break;
     case 66: enable = term->xtsave.application_keypad_keys; break;
+    case 67: return;
     case 80: enable = term->xtsave.sixel_display_mode; break;
     case 1000: enable = term->xtsave.mouse_click; break;
     case 1001: return;