diff --git a/README.md b/README.md
index ba68259..d517d15 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ $ keytool -export -alias calc -keystore calc.jks -rfc -file calc.csr
 
 **Important:** Add the certificate as a trusted one in Java Control Panel.
 For Mac: System Preferences > Java > Open Java Control Panel > Security tab > Manage certificates > User > Import.
-Import it possibly everywhere (trusted certificates, sercure site etc.).
+Import it possibly everywhere (trusted certificates, secure site etc.).
 
 - create *.jnlp file with a signed jar
 ```bash
diff --git a/build.gradle b/build.gradle
index 3a35330..c66de37 100644
--- a/build.gradle
+++ b/build.gradle
@@ -65,11 +65,15 @@ task genkey {
 
 task createJar(type: Jar) {
     manifest {
-        attributes 'Main-Class': 'com.hania.Runner'
-           //'Implementation-Title': rootProject.name,
-                //                'Implementation-Version': version,
+        attributes 'Implementation-Title': rootProject.name,
+                'Implementation-Version': version,
+                'Main-Class': 'com.hania.Runner'
     }
     baseName = project.name
     from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
     with jar
-}
\ No newline at end of file
+}
+
+task wrapper(type: Wrapper) {
+    gradleVersion = '4.7'
+}
diff --git a/calc.csr b/calc.csr
new file mode 100644
index 0000000..e43712e
--- /dev/null
+++ b/calc.csr
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/calc.jks b/calc.jks
new file mode 100644
index 0000000..271278c
Binary files /dev/null and b/calc.jks differ