diff --git a/doc/source/troubleshooting.rst b/doc/source/troubleshooting.rst
index 7b19a76781a18fa4b2ce0ea31fc689687e102d42..95eacd091a5db6aef1862a3caac57fe9077bf71b 100644
--- a/doc/source/troubleshooting.rst
+++ b/doc/source/troubleshooting.rst
@@ -9,3 +9,4 @@ When running through ssh, there are a few reasons that can avoid the display of
 
 See `Using OpenGL through ssh <http://www.silx.org/doc/silx/latest/troubleshooting.html#using-opengl-through-ssh>`_ in `silx <http://www.silx.org/doc/silx/latest/>`_ documentation for more information.
 
+You can disable the 3D view of the QSpace with the ``--no-3d`` option from the command line.
diff --git a/doc/source/usage/conversion.rst b/doc/source/usage/conversion.rst
index 0cd3d9cfa6474839385d3026108da9387088a3b0..7fd0090a64873418cbde9355b7751f7e170114ad 100644
--- a/doc/source/usage/conversion.rst
+++ b/doc/source/usage/conversion.rst
@@ -75,3 +75,9 @@ Q space Parameters
    * - ``Coordinates``
      - Select the coordinate system of the QSpace histogram.
        Either **Cartesian** or **Spherical**.
+
+The conversion from **Cartesian** to **Spherical** coordinates is as follows:
+
+* Radius: :math:`\sqrt(qx^2 + qy^2 + qz^2)`
+* Roll (Phi) in degrees: :math:`degrees(\pi/2 - arctan2(qz, qy))`
+* Pitch (Theta) in degrees: :math:`degrees(\pi/2 - arccos(qx/radius)`
diff --git a/doc/source/usage/project.rst b/doc/source/usage/project.rst
index 90c826749bc1ba24654ad4a92633609bfd3c0b17..c43b269951a9434f9661d917c8bb6f97c979a608 100644
--- a/doc/source/usage/project.rst
+++ b/doc/source/usage/project.rst
@@ -31,15 +31,15 @@ The next page gives you the choice between:
    To load data that has already been merged, select the `master` file of the merged data (the file that contains links to all entries).
    Once the project is created, the `Project summary`_ page is displayed.
 
-#. **Import SPEC data** to import K-map data from SPEC and EDF files.
+#. **Import SPEC data** to import K-map data SPEC and EDF files from the ESRF ID01 beamline.
 
    X-SOCS will merge the SPEC file and the EDF images into HDF5 files.
 
-   See `Merge SPEC and EDF to HDF5`_ below.
+   See `Merge ID01 SPEC and EDF to HDF5`_ below.
 
 
-Merge SPEC and EDF to HDF5
---------------------------
+Merge ID01 SPEC and EDF to HDF5
+--------------------------------
 
 When using X-SOCS to merge data the following window is displayed: