add a bit more to the abundance failure FAQ (AMReX-Astro#2517)

maxpkatz · Jul 4, 2023 · 1396465 · 1396465
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diff --git a/Docs/source/faq.rst b/Docs/source/faq.rst
@@ -202,6 +202,9 @@ Managing Runs
 Runtime Errors
 ==============
 
+.. index:: castro.limit_fluxes_on_small_dens, castro.state_interp_order,
+           castro.abundance_failure_tolerance, castro.abundance_failure_rho_cutoff
+
 #. *When running with retries, Castro requests too many substeps
    and crashes.*
 
@@ -221,7 +224,8 @@ Runtime Errors
 
    If the error continues, try to increase the tolerance of determining
    specie abundance validity check by setting ``castro.abundance_failure_tolerance``
-   to a higher value. 
+   to a higher value, or increasing the density floor below which this is
+   ignored by changing ``castro.abundance_failure_rho_cutoff``.
 
 Visualization
 =============

diff --git a/Docs/source/timestepping.rst b/Docs/source/timestepping.rst
@@ -205,7 +205,7 @@ which will subcycle twice at every level (except level 0).
 Retry Mechanism
 ---------------
 
-.. index:: castro.use_retry, castro.abundance_failure_tolerance, castro.retry_small_density_cutoff, castro.small_dens
+.. index:: castro.use_retry, castro.abundance_failure_tolerance, castro.abundance_failure_rho_cutoff, castro.retry_small_density_cutoff, castro.small_dens
 
 Castro's Strang CTU solver has a retry mechanism that can discard a
 time step on a level and restart with a smaller timestep, subcycling