diff --git a/java-cucumber-maven/README.md b/java-cucumber-maven/README.md
index 68bd1cc..a29995a 100644
--- a/java-cucumber-maven/README.md
+++ b/java-cucumber-maven/README.md
@@ -88,7 +88,7 @@ And the default is "Default run title", so you might want to change it.
 ## Run
 Run tests with
 ```sh
-   mvn test -D=tstmt_key
+   mvn test -Dtestomatio.api.key=tstmt_key
 ```
 where `tstmt_key` is your Testomat.io key from a particular project.
 
diff --git a/java-junit-maven-0.1.0/README.md b/java-junit-maven-0.1.0/README.md
index 6762526..68b8d68 100644
--- a/java-junit-maven-0.1.0/README.md
+++ b/java-junit-maven-0.1.0/README.md
@@ -92,7 +92,7 @@ And the default is "Default run title", so you might want to change it.
 Run tests with
 
 ```sh 
-   mvn test -D=tstmt_key
+   mvn test -Dtestomatio.api.key=tstmt_key
 ```
 
 where `tstmt_key` is your Testomat.io key from a particular project.
diff --git a/java-testng-maven-0.1.0/README.md b/java-testng-maven-0.1.0/README.md
index 4a30355..0934d49 100644
--- a/java-testng-maven-0.1.0/README.md
+++ b/java-testng-maven-0.1.0/README.md
@@ -93,7 +93,7 @@ And the default is "Default run title", so you might want to change it.
 Run tests with
 
 ```sh 
-   mvn test -D=tstmt_key
+   mvn test -Dtestomatio.api.key=tstmt_key
 ```
 
 where `tstmt_key` is your Testomat.io key from a particular project.