Making sure widget-manager is installed on Jupyterlab.

Author: Zerline

README.rst

@@ -19,7 +19,9 @@ Also :
 Installation
 ------------
 
-   $ pip3 install sage_combinat_widgets
+Assuming your pip install on Python3:
+
+   $ pip install sage_combinat_widgets
 
 
 Local install from source
@@ -35,6 +37,11 @@ Change to the root directory and run::
 
 NB: For this to work, you need a recent `nodejs` installation.
 
+For use on Jupyterlab, you might also need to install `@jupyter-widgets/jupyterlab-manager`:
+
+    $ jupyter labextension @jupyter-widgets/jupyterlab-manager
+
+
 Usage
 -----