diff --git a/Changelog.md b/Changelog.md
index c8214a4..40bd29d 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 3.4.2a1
+
+- Alpha release for exporting type hints
+
 ## 3.4.1
 
 - `PromptTemplate` now resets cached non-text items after generating prompt
diff --git a/aleph_alpha_client/py.typed b/aleph_alpha_client/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/aleph_alpha_client/version.py b/aleph_alpha_client/version.py
index a5cfdf5..f29ec04 100644
--- a/aleph_alpha_client/version.py
+++ b/aleph_alpha_client/version.py
@@ -1 +1 @@
-__version__ = "3.4.1"
+__version__ = "3.4.2a1"
diff --git a/setup.py b/setup.py
index 77a526a..62e6d4e 100644
--- a/setup.py
+++ b/setup.py
@@ -39,6 +39,7 @@ def version():
     author="Aleph Alpha",
     author_email="support@aleph-alpha.com",
     packages=["aleph_alpha_client"],
+    package_data={"aleph_alpha_client": ["py.typed"]},
     # urllib is used directly for retries
     install_requires=[
         "requests >= 2.28",
diff --git a/tests/test_prompt_template.py b/tests/test_prompt_template.py
index 52a4ba7..36d8de1 100644
--- a/tests/test_prompt_template.py
+++ b/tests/test_prompt_template.py
@@ -163,3 +163,12 @@ def test_to_prompt_works_with_tokens():
     prompt = template.to_prompt(user_prompt=template.embed_prompt(user_prompt))
 
     assert prompt == user_prompt
+
+def test_to_prompt_resets_cache(prompt_image: Image):
+    user_prompt = Prompt([prompt_image, Text.from_text("Cool"), prompt_image])
+    
+    template = PromptTemplate("{{user_prompt}}")
+
+    template.to_prompt(user_prompt=template.embed_prompt(user_prompt))
+
+    assert template.non_text_items == {}