diff --git a/README.md b/README.md
index c24a95b2..ebd03819 100644
--- a/README.md
+++ b/README.md
@@ -10,17 +10,17 @@ for moderately high power electronics.  It has not yet burned down my
 
 # Specifications #
 
-| Name                  | r4.11          | n1        |
-|-----------------------|----------------|-----------|
-| Voltage Input         | 10-44V         | 10-54V    |
-| Peak Electrical Power | 500W           | 1200W     |
-| Mass                  | 14.2g          | 14.6g     |
-| Control Rate          | 15-30kHz       | -         |
-| PWM Switching Rate    | 15-60kHz       | -         |
-| CPU                   | 170Mhz STM32G4 | -         |
-| Peak phase current    | 100A           | -         |
-| Communications        | 5Mbps CAN-FD   | -         |
-| Dimensions            | 46x53mm        | 46x46x8mm |
+| Name                  | r4.11          | c1        | n1        |
+|-----------------------|----------------|-----------|-----------|
+| Voltage Input         | 10-44V         | 10-51V    | 10-54V    |
+| Peak Electrical Power | 500W           | 100W      | 1200W     |
+| Mass                  | 14.2g          | 8.9g      | 14.6g     |
+| Control Rate          | 15-30kHz       | -         | -         |
+| PWM Switching Rate    | 15-60kHz       | -         | -         |
+| CPU                   | 170Mhz STM32G4 | -         | -         |
+| Peak phase current    | 100A           | 20A       | 100A      |
+| Communications        | 5Mbps CAN-FD   | -         | -         |
+| Dimensions            | 46x53mm        | 38x38x9mm | 46x46x8mm |
 
 Assembled and tested boards can be purchased at: https://mjbots.com
 
diff --git a/docs/reference.md b/docs/reference.md
index 4c8db113..4f42ea9a 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -173,11 +173,11 @@ used for various functions.
 
 ELECTRICAL NOTES:
  * The 3.3V supply pins can power external peripherals:
-   * r4.5: 50mA
+   * r4.5/c1: 50mA
    * r4.8/r4.11/n1: 100mA
  * The 5V supply pins can power external peripherals:
    * r4: not present
-   * n1: 100mA
+   * n1/c1: 100mA
  * Some pins are 5V tolerant.  Those not marked as such in the pin
    option table are 3.3V only.
 
@@ -283,7 +283,7 @@ The following table shows which pins can be used for the unique capabilities:
 | I                | 5   | 2   | MISO | X           |     |         |      |     |
 | O                | 6   | 3   | MOSI | X           |     |         |      |     |
 
-| moteus n1        | Con | AUX | SPI  | ADC/Sin/Cos | I2C | HW Quad | UART | 5VT |
+| moteus n1/c1     | Con | AUX | SPI  | ADC/Sin/Cos | I2C | HW Quad | UART | 5VT |
 |------------------|-----|-----|------|-------------|-----|---------|------|-----|
 | 5V (5)           | 1   |     |      |             |     |         |      |     |
 | 3.3V (3)         | 2   |     |      |             |     |         |      |     |
@@ -298,6 +298,10 @@ NOTE: For moteus n1, the B pin software configured pullup cannot be
 used effectively.  Thus the B pin is unsuitable for open-drain inputs
 like hall effect sensors unless external pullups are provided.
 
+NOTE: For moteus c1, only the D and E pins are exposed, and only on an
+unpopulated 0.05" through hole land pattern.  Additionally, I2C
+pullups are not available on moteus-c1 for aux1.
+
 #### AUX2 / ABS ####
 
 | moteus r4.5/8/11 | Con | Aux | SPI  | ADC/Sin/Cos | I2C | HW Quad | UART | 5VT |
@@ -309,7 +313,7 @@ like hall effect sensors unless external pullups are provided.
 | DBG 1            |     | 2   |      |             |     |         |      | X   |
 | DBG 2            |     | 3   |      |             |     |         |      | X   |
 
-| moteus n1        | Con | AUX | SPI  | ADC/Sin/Cos | I2C | HW Quad | UART | 5VT |
+| moteus n1/c1     | Con | AUX | SPI  | ADC/Sin/Cos | I2C | HW Quad | UART | 5VT |
 |------------------|-----|-----|------|-------------|-----|---------|------|-----|
 | 5V (5)           | 1   |     |      |             |     |         |      |     |
 | 3.3V (3)         | 2   |     |      |             |     |         |      |     |
@@ -2368,7 +2372,7 @@ RS422, configured by AUX1 D/E to USART and enabling RS422 on AUX1.
  - 7 - E
  - 8 - GND
 
-### moteus n1 - AUX2 - JST GH-7 ###
+### moteus n1/c1 - AUX2 - JST GH-7 ###
 
  - 1 - 5V
  - 2 - 3.3V