diff --git a/doc/src/compute_property_atom.rst b/doc/src/compute_property_atom.rst
index 4484c3b697..f370c31f00 100644
--- a/doc/src/compute_property_atom.rst
+++ b/doc/src/compute_property_atom.rst
@@ -34,6 +34,8 @@ Syntax
                              i_name, d_name, i2_name[I], d2_name[I],
                              vfrac, s0, espin, eradius, ervel, erforce,
                              rho, drho, e, de, cv, buckling,
+                             apip_lambda, apip_lambda_input, apip_e_fast,
+                             apip_e_precise
 
   .. parsed-literal::
 
@@ -70,6 +72,13 @@ Syntax
            *i2_name[I]* = Ith column of custom integer array with name
            *d2_name[I]* = Ith column of custom floating-point array with name
 
+  .. parsed-literal::
+
+           APIP package per-atom properties:
+           *apip_lambda* = switching parameter
+           *apip_lambda_input* = input used to calculate the switching parameter
+           *apip_e_fast,apip_e_precise* = potential energies mixed by the adaptive-precision potential
+
   .. parsed-literal::
 
            PERI package per-atom properties:
@@ -162,6 +171,22 @@ segment particles and define the end points of each line segment.
 *corner2z*, *corner3x*, *corner3y*, *corner3z*, are defined for
 triangular particles and define the corner points of each triangle.
 
+The accessible quantities from the :doc:`APIP package <Howto_apip>` are
+explained in the doc pages of this package in detail.
+In short: *apip_lambda* is the switching parameter :math:`\lambda\in[0,1]`,
+that is calculated from *apip_lambda_input* and that mixes the energies
+of a fast (*apip_e_fast*) and a precise (*apip_e_precise*) potential
+into an adaptive-precision energy.
+
+.. note::
+
+   The energy according to the fast and the precise potential are only
+   computed for the subset of atoms, for which it is required, i.e.,
+   for an atom :math:`i` with :math:`\lambda_i=1` one does not need
+   :math:`E_i^\text{precise}` and with :math:`\lambda_i=0` one does
+   not need :math:`E_i^\text{fast}`.
+
+
 In addition, the various per-atom quantities listed above for specific
 packages are only accessible by this command.
 
diff --git a/doc/src/read_dump.rst b/doc/src/read_dump.rst
index 7f0e5bee42..b2963a19b9 100644
--- a/doc/src/read_dump.rst
+++ b/doc/src/read_dump.rst
@@ -16,12 +16,13 @@ Syntax
 
   .. parsed-literal::
 
-     field = *x* or *y* or *z* or *vx* or *vy* or *vz* or *q* or *ix* or *iy* or *iz* or *fx* or *fy* or *fz*
+     field = *x* or *y* or *z* or *vx* or *vy* or *vz* or *q* or *ix* or *iy* or *iz* or *fx* or *fy* or *fz* or *apip_lambda*
        *x*,\ *y*,\ *z* = atom coordinates
        *vx*,\ *vy*,\ *vz* = velocity components
        *q* = charge
        *ix*,\ *iy*,\ *iz* = image flags in each dimension
        *fx*,\ *fy*,\ *fz* = force components
+       *apip_lambda* = switching parameter of an :doc:`adaptive-precision interatomic potential <Howto_apip>`
 
 * zero or more keyword/value pairs may be appended
 * keyword = *nfile* or *box* or *timestep* or *replace* or *purge* or *trim* or *add* or *label* or *scaled* or *wrapped* or *format*