diff --git a/README.md b/README.md
index 60ad664..2c537ab 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ Extension board for [Sizif-512](https://github.com/UzixLS/zx-sizif-512).
 
 ### Changelog & current status
 * Rev.A - first release. Please note the [errata](pcb/rev.A/ERRATA.txt).
-* Rev.A1 - fixed all known issues of rev.A.
+* Rev.A1 - fixed all known issues of rev.A. Please note the [errata](pcb/rev.A1/ERRATA.txt).
 
 ### Related projects
 * Turbo Sound FM ([link](http://www.nedopc.com/TURBOSOUND/ts-fm.php))
diff --git a/pcb/rev.A/ERRATA.txt b/pcb/rev.A/ERRATA.txt
index 921243b..2ec7518 100644
--- a/pcb/rev.A/ERRATA.txt
+++ b/pcb/rev.A/ERRATA.txt
@@ -1,3 +1,6 @@
 - MIDI_IN is connected to U4/pin13, should be U4/pin14
 - Incorrect ZX BUS pinout. Following signal pairs should be swapped: NMI/MIX_R, MIX_L/RST, CLKCPU/A1
 - Incorrect connection between U5/pin4, U10/pin4 and U7/pin28. Should be cutted.
+
+UPD. 2023-09-18:
+- R1 and R34 should be 10kOhm
diff --git a/pcb/rev.A1/ERRATA.txt b/pcb/rev.A1/ERRATA.txt
new file mode 100644
index 0000000..589cb7f
--- /dev/null
+++ b/pcb/rev.A1/ERRATA.txt
@@ -0,0 +1 @@
+- R1 and R34 should be 10kOhm