diff --git a/docs/source/io_formats/nuclear_data.rst b/docs/source/io_formats/nuclear_data.rst
index 81e4f4bcd..957bfa3a3 100644
--- a/docs/source/io_formats/nuclear_data.rst
+++ b/docs/source/io_formats/nuclear_data.rst
@@ -165,6 +165,10 @@ Incident Photon Data
            - **J** (*double[][]*) -- Compton profile for each subshell in units
              of :math:`\hbar / (me^2)`
 
+**/<element>/heating/**
+
+:Datasets: - **xs** (*double[]*) -- Total heating cross section in [b-eV]
+
 **/<element>/incoherent/**
 
 :Datasets: - **xs** (*double[]*) -- Incoherent scattering cross section in [b]
diff --git a/docs/source/usersguide/tallies.rst b/docs/source/usersguide/tallies.rst
index 6ab4af84c..f005b5060 100644
--- a/docs/source/usersguide/tallies.rst
+++ b/docs/source/usersguide/tallies.rst
@@ -258,7 +258,10 @@ The following tables show all valid scores:
     +----------------------+---------------------------------------------------+
     |heating               |Total nuclear heating in units of eV per source    |
     |                      |particle. For neutrons, this corresponds to MT=301 |
-    |                      |produced by NJOY's HEATR module.                   |
+    |                      |produced by NJOY's HEATR module while for photons, |
+    |                      |this is tallied from either direct photon energy   |
+    |                      |deposition (analog estimator) or pre-generated     |
+    |                      |photon heating number.                             |
     +----------------------+---------------------------------------------------+
     |kappa-fission         |The recoverable energy production rate due to      |
     |                      |fission. The recoverable energy is defined as the  |