diff --git a/docs/source_docs/user_guide/inputs/initial_conditions.rst b/docs/source_docs/user_guide/inputs/initial_conditions.rst
index 0af28ed7cace858d07e30a36ab04e8ca6f6efc24..12195a9a5a5f7ea157e8bdccf6d4c9d13eb934e4 100644
--- a/docs/source_docs/user_guide/inputs/initial_conditions.rst
+++ b/docs/source_docs/user_guide/inputs/initial_conditions.rst
@@ -73,6 +73,8 @@ using the ``ic.[region]`` compound prefix.
 
 For each initial condition region, the solid inputs are defined
 using the ``ic.[region].[solid]`` compound prefix.
+Note that diameter distributions must define a weighting type, 
+please refer to :ref:`ReferenceParticleDistributions <ReferenceParticleDistributions>`.
 
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
 |                     | Description                                                           |   Type      | Default   |
@@ -93,6 +95,11 @@ using the ``ic.[region].[solid]`` compound prefix.
 |                     | * 'normal'    -- normal distribution                                  |             |           |
 |                     | * 'custom'    -- user defined distribution                            |             |           |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
+| type                | distribution weighting: ``number-weighted`` or ``volume-weighted``    | string      | N/A       |
++---------------------+-----------------------------------------------------------------------+-------------+-----------+
+| bins                | Number of bins used when discretizing the distribution to approximate | int         | 64        |
+|                     | the number of particles within an initial condition region.           |             |           |
++---------------------+-----------------------------------------------------------------------+-------------+-----------+
 | diameter.constant   | Monodisperse (single valued) particle diameter.                       | Real        | 0         |
 |                     | Required for ``constant`` distributions.                              |             |           |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
@@ -209,8 +216,15 @@ Below is an example for specifying an initial condition for a fluid (``fluid``)
 
    ic.bed1.solid0.velocity =  0.10  0.00  0.00
 
-   ic.bed1.solid0.diameter = constant
-   ic.bed1.solid0.diameter.constant =  110.0e-6
 
-   ic.bed1.solid0.density  = constant
-   ic.bed1.solid0.density.constant  = 900.0
+   ic.bed1.solid0.diameter = uniform
+   ic.bed1.solid0.diameter.type = number-weighted
+   ic.bed1.solid0.diameter.bins = 20
+   ic.bed1.solid0.diameter.min =   90.0e-6
+   ic.bed1.solid0.diameter.max =  110.0e-6
+
+   ic.bed1.solid0.density  = normal
+   ic.bed1.solid0.density.mean  = 900.0
+   ic.bed1.solid0.density.std  =   30.0
+   ic.bed1.solid0.density.min  =  800.0
+   ic.bed1.solid0.density.max  = 1000.0