diff --git a/src/temperatur.h b/src/temperatur.h
index 30e1a0f..9cb94b5 100644
--- a/src/temperatur.h
+++ b/src/temperatur.h
@@ -2,5 +2,6 @@
 #define TEMPERATUR_H
 
 float CzuF(float tempC);
+float CzuK(float tempC);
 
 #endif //TEMPERATUR_H
diff --git a/test/test_temperatur.c b/test/test_temperatur.c
index e46691b..584ce47 100644
--- a/test/test_temperatur.c
+++ b/test/test_temperatur.c
@@ -19,4 +19,11 @@ float expected = 77;
 TEST_ASSERT_EQUAL(expected, result);
 }
 
+void test_temperaturRechner_CzuK(void)
+{
+float result = CzuK(25);
+float expected = 298.15;
+TEST_ASSERT_EQUAL(expected, result);
+}
+
 #endif