diff --git a/docs/api.rst b/docs/api.rst
index 1b63e0a..f4b6ccf 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -3,5 +3,20 @@ API Reference
 *************
 
 .. automodapi:: hvpy
+
+IO
+==
+
+.. automodapi:: hvpy.io
+
+core
+====
+
+.. automodapi:: hvpy.core
+
+parameters
+==========
+
+.. automodapi:: hvpy.parameters
     :inherited-members:
     :include-all-objects:
diff --git a/hvpy/io.py b/hvpy/io.py
index 9362e4a..171e9e2 100644
--- a/hvpy/io.py
+++ b/hvpy/io.py
@@ -3,6 +3,7 @@
 from pydantic import BaseModel
 
 BASE_URL = "https://api.helioviewer.org/v2/"
+__all__ = ["HvpyParameters", "OutputType"]
 
 
 class HvpyParameters(BaseModel):
diff --git a/hvpy/parameters.py b/hvpy/parameters.py
new file mode 100644
index 0000000..6c9bbdf
--- /dev/null
+++ b/hvpy/parameters.py
@@ -0,0 +1,3 @@
+from hvpy.api_groups.jpeg2000.get_jp2_image import getJP2ImageInputParameters
+
+__all__ = ["getJP2ImageInputParameters"]