diff --git a/src/cfwstring.c b/src/cfwstring.c
index 1c913ed..239b343 100644
--- a/src/cfwstring.c
+++ b/src/cfwstring.c
@@ -131,6 +131,23 @@ cfw_string_set(CFWString *str, const char *cstr)
 	return true;
 }
 
+bool
+cfw_string_append(CFWString *str, CFWString *append)
+{
+	char *new;
+
+	if ((new = realloc(str->cstr, str->len + append->len + 1)) == NULL)
+		return false;
+
+	memcpy(new + str->len, append->cstr, append->len);
+	new[str->len + append->len] = 0;
+
+	str->cstr = new;
+	str->len += append->len;
+
+	return true;
+}
+
 static CFWClass class = {
 	.name = "CFWString",
 	.size = sizeof(CFWString),
diff --git a/src/cfwstring.h b/src/cfwstring.h
index 9424334..6572f28 100644
--- a/src/cfwstring.h
+++ b/src/cfwstring.h
@@ -34,5 +34,6 @@ extern CFWClass *cfw_string;
 extern const char* cfw_string_c(CFWString*);
 extern size_t cfw_string_len(CFWString*);
 extern bool cfw_string_set(CFWString*, const char*);
+extern bool cfw_string_append(CFWString*, CFWString*);
 
 #endif
diff --git a/tests/tests.c b/tests/tests.c
index efcb511..6962553 100644
--- a/tests/tests.c
+++ b/tests/tests.c
@@ -38,13 +38,25 @@ main()
 	size_t i;
 
 	s[0] = cfw_new(cfw_string, "Hallo");
-	s[1] = cfw_new(cfw_string, "Welt");
+	s[1] = cfw_new(cfw_string, " Welt");
 	s[2] = cfw_new(cfw_string, "!");
 
 	a = cfw_new(cfw_array, s[0], s[1], s[2], NULL);
 
+	cfw_unref(s[0]);
+	cfw_unref(s[1]);
+	cfw_unref(s[2]);
+
+	s[0] = cfw_new(cfw_string, NULL);
+
 	for (i = 0; i < cfw_array_size(a); i++)
-		puts(cfw_string_c(cfw_array_get(a, i)));
+		cfw_string_append(s[0], cfw_array_get(a, i));
+
+	cfw_unref(a);
+
+	puts(cfw_string_c(s[0]));
+
+	cfw_unref(s[0]);
 
 	return 0;
 }