diff --git a/docs/environment.yml b/docs/environment.yml
index 28ec3cb11..2559f9466 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -6,3 +6,4 @@ dependencies:
   - paramiko
   - requests
   - numpydoc
+  - sphinx_rtd_theme
diff --git a/docs/source/api.rst b/docs/source/api.rst
index 4cac31fa2..f2a7109c8 100644
--- a/docs/source/api.rst
+++ b/docs/source/api.rst
@@ -81,6 +81,7 @@ Built-in Implementations
 ------------------------
 
 .. autosummary::
+   fsspec.registry.known_implementations
    fsspec.implementations.ftp.FTPFileSystem
    fsspec.implementations.hdfs.PyArrowHDFS
    fsspec.implementations.dask.DaskWorkerFileSystem
@@ -98,6 +99,8 @@ Built-in Implementations
    fsspec.implementations.git.GitFileSystem
    fsspec.implementations.smb.SMBFileSystem
    fsspec.implementations.jupyter.JupyterFileSystem
+   
+.. autofunction:: fsspec.registry.known_implementations
 
 .. autoclass:: fsspec.implementations.ftp.FTPFileSystem
    :members: __init__
diff --git a/docs/source/index.rst b/docs/source/index.rst
index a36510f1b..2baeeadf5 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -55,7 +55,7 @@ The current list of known implementations can be found as follows
     known_implementations
 
 These are only imported on request, which may fail if a required dependency is missing. The dictionary
-``fsspec.registry`` contains all imported implementations, and can be mutated by user code, if necessary.
+:py:class:`fsspec.registry.known_implementations` contains all imported implementations, and can be mutated by user code, if necessary.
 
 
 .. toctree::