diff --git a/assertions/directoryNotEmpty.ts b/assertions/directoryNotEmpty.ts
new file mode 100644
index 00000000..2b9c33e3
--- /dev/null
+++ b/assertions/directoryNotEmpty.ts
@@ -0,0 +1,9 @@
+import * as fs from "fs";
+
+export class DirectoryNotEmpty {
+    public static run(directory: string): void {
+        if(fs.readdirSync(directory).length == 0) {
+            throw new Error("directory " + directory + " is empty");
+        }
+    }
+}
\ No newline at end of file
diff --git a/assertions/index.ts b/assertions/index.ts
index e1607dbf..691dbfbb 100644
--- a/assertions/index.ts
+++ b/assertions/index.ts
@@ -5,6 +5,7 @@ import { NoErrorCode } from "./noErrorCode";
 import { NoException } from "./noException";
 import { DirectoryExist } from "./directoryExist";
 import { FileExist } from "./fileExist";
+import { DirectoryNotEmpty } from "./directoryNotEmpty";
 
 
 export class Assertions {
@@ -24,6 +25,11 @@ export class Assertions {
         return this;
     }
 
+    public directoryNotEmpty(directory: string): Assertions {
+        DirectoryNotEmpty.run(directory);
+        return this;
+    }
+
     public fileExits(filepath: string): Assertions {
         FileExist.run(filepath);
         return this;
diff --git a/documentation/Functions.md b/documentation/Functions.md
index 2a520c97..9ef2396e 100644
--- a/documentation/Functions.md
+++ b/documentation/Functions.md
@@ -35,7 +35,7 @@ cobiGenJava("path/to/java/file/MyEntity.java",[1,3,5,6,8])
 
 ### createDevon4jProject
 #### parameter 
-1. the project name
+1. The project name
 #### example 
 createDevon4jProject("cobigenexample")
 
diff --git a/runners/console/index.ts b/runners/console/index.ts
index 9864d107..bb1219db 100644
--- a/runners/console/index.ts
+++ b/runners/console/index.ts
@@ -104,7 +104,7 @@ export class Console extends Runner {
     }
 
     async assertCobiGenJava(step: Step, command: Command, result: RunResult) {
-        console.log("assertCobiGenJava");
+        console.log("there is no assertion yet for the cobiGenJava command");
     }
 
     async assertCreateDevon4jProject(step: Step, command: Command, result: RunResult) {