diff --git a/server/src/main/java/org/openqa/selenium/server/SeleniumServer.java b/server/src/main/java/org/openqa/selenium/server/SeleniumServer.java
index <HASH>..<HASH> 100644
--- a/server/src/main/java/org/openqa/selenium/server/SeleniumServer.java
+++ b/server/src/main/java/org/openqa/selenium/server/SeleniumServer.java
@@ -362,7 +362,7 @@ public class SeleniumServer {
                 if ("".equals(userInput)) continue;

                 

                 if (!userInput.startsWith("cmd=") && !userInput.startsWith("commandResult=")) {

-                    System.err.println("ERROR -  Invalid command: " + userInput);

+                    System.err.println("ERROR -  Invalid command: \"" + userInput + "\"");

                     continue;

                 }
Show invalid user input with quotes so that it will be easier to see leading spaces



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