diff --git a/pynxtools/definitions b/pynxtools/definitions
index da544c9be..2ac33b2cf 160000
--- a/pynxtools/definitions
+++ b/pynxtools/definitions
@@ -1 +1 @@
-Subproject commit da544c9be46a0d77d877915f59b3a13b698c0c8f
+Subproject commit 2ac33b2cfd753410cfd7e24993d24473453d835d
diff --git a/pynxtools/nexus-version.txt b/pynxtools/nexus-version.txt
index ade034694..29e560261 100644
--- a/pynxtools/nexus-version.txt
+++ b/pynxtools/nexus-version.txt
@@ -1 +1 @@
-v2020.10-1558-gda544c9b
+v2020.10-1637-g2ac33b2cf
\ No newline at end of file
diff --git a/tests/data/nexus/Ref_nexus_test.log b/tests/data/nexus/Ref_nexus_test.log
index d5da77390..c20c49feb 100644
--- a/tests/data/nexus/Ref_nexus_test.log
+++ b/tests/data/nexus/Ref_nexus_test.log
@@ -1445,9 +1445,9 @@ NXsource.nxdl.xml:/energy
 DEBUG - <<OPTIONAL>>
 DEBUG - documentation (NXsource.nxdl.xml:/energy):
 DEBUG - 
-             Source energy.
-             For storage rings, this would be the particle beam energy.
-             For X-ray tubes, this would be the excitation voltage.
+             Source energy. Typically, this would be the energy of
+             the emitted beam. For storage rings, this would be
+             the particle beam energy.
         
 DEBUG - ===== ATTRS (//entry/instrument/source/energy@units)
 DEBUG - value: MeV