diff --git a/docs/api/tuf.ngclient.fetcher.rst b/docs/api/tuf.ngclient.fetcher.rst
index f37ea14f..466ff389 100644
--- a/docs/api/tuf.ngclient.fetcher.rst
+++ b/docs/api/tuf.ngclient.fetcher.rst
@@ -3,3 +3,4 @@ Fetcher
 
 .. automodule:: tuf.ngclient.fetcher
    :undoc-members:
+   :private-members: _fetch
\ No newline at end of file
diff --git a/tuf/ngclient/fetcher.py b/tuf/ngclient/fetcher.py
index 3960477e..f13c8934 100644
--- a/tuf/ngclient/fetcher.py
+++ b/tuf/ngclient/fetcher.py
@@ -23,6 +23,9 @@ class FetcherInterface:
     By providing a concrete implementation of the abstract interface,
     users of the framework can plug-in their preferred/customized
     network stack.
+
+    Implementations of FetcherInterface only need to implement ``_fetch()``.
+    The public API of the class is already implemented.
     """
 
     __metaclass__ = abc.ABCMeta