diff --git a/beam-command.asciidoc b/beam-command.asciidoc
index 662a1d1a57834cc5686d987586893cae74debdc1..43a4176a9371d5c1026388e8713b681635792e81 100644
--- a/beam-command.asciidoc
+++ b/beam-command.asciidoc
@@ -110,7 +110,8 @@ NPART::
   The number of macro particles for the simulations
 NSLICE::
   The number of slices per bunch
-
+MOMENTUM_TOLERANCE::
+  Fractional tolerance to deviations in the distribution compared to the reference momentum at initialisation. If <= 0, no tolerance checking is done (default=1e-2).
 
 [[sec.beam.bibliography]]
 === References
diff --git a/elements.asciidoc b/elements.asciidoc
index f743865476d61200b8205b18b025af79c4b8b5f3..04ce7d8a801b84aebc8c86f479c138e52e83d86a 100644
--- a/elements.asciidoc
+++ b/elements.asciidoc
@@ -1749,7 +1749,7 @@ This is a restricted feature: _OPAL-cycl_.
 label: RINGDEFINITION,
        RFFREQ=real, HARMONIC_NUMBER=real, IS_CLOSED=string, SYMMETRY=int,
        LAT_RINIT=real, LAT_PHIINIT=real, LAT_THETAINIT=real,
-       BEAM_PHIINIT=real, BEAM_PRINIT=real, BEAM_RINIT=real;
+       BEAM_PHIINIT=real, BEAM_THETAINIT=real, BEAM_PRINIT=real, BEAM_RINIT=real;
 ----
 
 A `RingDefinition` object contains the main characteristics of a
@@ -1781,6 +1781,8 @@ BEAM_RINIT::
   Initial radius of the reference trajectory [m].
 BEAM_PHIINIT::
   Initial azimuthal angle of the reference trajectory [degree].
+BEAM_THETAINIT::
+  Additional rotation of the beam direction relative to the ring tangent [degree].
 BEAM_PRINIT::
   Transverse momentum latexmath:[\beta \gamma] for the reference
   trajectory.