diff --git a/Documentation/i2c/smbus-protocol.rst b/Documentation/i2c/smbus-protocol.rst
index c2e29633071ec..64689d19dd518 100644
--- a/Documentation/i2c/smbus-protocol.rst
+++ b/Documentation/i2c/smbus-protocol.rst
@@ -57,7 +57,7 @@ SMBus Quick Command
 
 This sends a single bit to the device, at the place of the Rd/Wr bit::
 
-  A Addr Rd/Wr [A] P
+  S Addr Rd/Wr [A] P
 
 Functionality flag: I2C_FUNC_SMBUS_QUICK