Update README.md (#16670)

Added information when having one device attached

Signed-off-by: Matúš Hromada <matushromada@gmail.com>

diff --git a/bundles/org.openhab.binding.serial/README.md b/bundles/org.openhab.binding.serial/README.md
index 8eed5486d77456ac732ef906264c9762d810f230..80268098848c6f158b616139b110f6e80ef758d7 100644 (file)
--- a/bundles/org.openhab.binding.serial/README.md
+++ b/bundles/org.openhab.binding.serial/README.md
@@ -55,9 +55,9 @@ The configuration for the `serialBridge` consists of the following parameters:
 
 The configuration for the `serialDevice` consists of the following parameters:
 
-| Parameter    | Description                                                                                           |
-| ------------ | ----------------------------------------------------------------------------------------------------- |
-| patternMatch | Regular expression used to identify device from received data (must match the whole line) (mandatory) |
+| Parameter    | Description                                                                                                                                        |
+| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------- |
+| patternMatch | Regular expression used to identify device from received data (must match the whole line). Use .* when having only one device attached. (mandatory)|
 
 ## Channels