diff --git a/bundles/binding/org.openhab.binding.mcp23017/README.md b/bundles/binding/org.openhab.binding.mcp23017/README.md
index 179257b0e4a..eeaf4f13516 100644
--- a/bundles/binding/org.openhab.binding.mcp23017/README.md
+++ b/bundles/binding/org.openhab.binding.mcp23017/README.md
@@ -19,10 +19,10 @@ Since MCP23017 is digital IO expander on I2C bus, only two types of items are su
 Contact Test1 "Test 1" (Tests) { mcp23017="{ address:21, pin:'A0', mode:'DIGITAL_INPUT'}" }
 ```
 
-configures pin 0 at bank A (GPA0 on datasheet) as input of the IC on address 0x20
+configures pin 0 at bank A (GPA0 on datasheet) as input of the IC on address 0x21
 
 ```
 Switch Test2 "Test 2" (Tests) { mcp23017="{ address:21, pin:'B1', mode:'DIGITAL_OUTPUT', defaultState:'LOW'}" }
 ```
 
-configures pin 1 at bank B (GPB1 on datasheet) as output of the IC on adress 0x21
\ No newline at end of file
+configures pin 1 at bank B (GPB1 on datasheet) as output of the IC on adress 0x21