diff --git a/docs/source/manual/fixpoint_arithmetics.rst b/docs/source/manual/fixpoint_arithmetics.rst
index ae87b9baf..8c0093bb5 100644
--- a/docs/source/manual/fixpoint_arithmetics.rst
+++ b/docs/source/manual/fixpoint_arithmetics.rst
@@ -16,7 +16,7 @@ and whether the MSB represents the sign bit or not, is in the designers head ...
 
 .. figure:: ../img/manual/twos_complement_int.png
    :alt: Integer number in twos-complement format
-   :width: 60%
+   :width: 50%
    :align: center
 
    Signed integer number in twos-complement format
diff --git a/docs/source/manual/index.rst b/docs/source/manual/index.rst
index 7ac426ba6..96fd9d65c 100644
--- a/docs/source/manual/index.rst
+++ b/docs/source/manual/index.rst
@@ -11,7 +11,10 @@ User Manual
    Screenshot of pyfda
 
 :numref:`fig_pyfda_screenshot` shows the main pyfda screen with three subwindows 
-that can be resized with the handles (red dots):
+that can be resized with the handles (red dots).
+
+The tabs on the left-hand side access widgets to enter and view various
+specification and parameters for the filter / system to be designed resp. analyzed.
 
    .. toctree::
       :maxdepth: 1
@@ -23,8 +26,7 @@ that can be resized with the handles (red dots):
       input_info
       input_fixpoint_specs
 
-   The tabs on the left-hand side access widgets to enter and view various
-   specification and parameters for the filter / system to be designed resp. analyzed.
+   The subwidgets on the right-hand side allow for graphical analyses of the system.
 
    .. toctree::
       :maxdepth: 1
@@ -37,7 +39,14 @@ that can be resized with the handles (red dots):
       plot_impz
       plot_3d
 
-   The subwidgets on the right-hand side allow for graphical analyses of the system.
+Some documentation treats general filter design and fixpoint arithmetics stuff.
+
+   .. toctree::
+      :maxdepth: 1
+      :caption: General Documentation
+
+      fixpoint_arithmetics
+
 
 Logger Subwindow
 ----------------