diff --git a/README.md b/README.md
index fcdee1a..877c43f 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ dependencies {
 
 ### Documentation
 Use autocompletion and hover menus in your IDE, or download the
-[generated HTML documentation](https://git.koval.net/cyclane/teamcity-gitea-test-task/releases/download/v0.1.1/tinyvm-0.1.1-javadoc.zip)
+generated HTML documentation
 from the [latest release](https://git.koval.net/cyclane/teamcity-gitea-test-task/releases).
 
 ## Instructions
diff --git a/src/test/kotlin/tinyvm/RepositoryTest.kt b/src/test/kotlin/tinyvm/RepositoryTest.kt
index 4a7a7a0..965c48f 100644
--- a/src/test/kotlin/tinyvm/RepositoryTest.kt
+++ b/src/test/kotlin/tinyvm/RepositoryTest.kt
@@ -1,5 +1,6 @@
 package tinyvm
 
+import org.junit.jupiter.api.assertThrows
 import java.time.Instant
 import kotlin.test.Test
 import kotlin.test.assertEquals
@@ -132,6 +133,13 @@ internal class RepositoryTest {
         assertEquals(10, repository.dumpObjects().size)
     }
 
+    @Test
+    fun `cannot use non-existent branch`() {
+        assertThrows<BranchNotFoundException> {
+            repository.useBranch("test-branch")
+        }
+    }
+
     @Test
     fun `can commit to branch`() {
         repository.commit(commits[0])