diff --git a/input/thermo/groups/radical.py b/input/thermo/groups/radical.py
index 876397ac31..0f428202fc 100644
--- a/input/thermo/groups/radical.py
+++ b/input/thermo/groups/radical.py
@@ -9036,7 +9036,7 @@
     thermo = ThermoData(
         Tdata = ([300,400,500,600,800,1000,1500],'K'),
         Cpdata = ([-0.762975,-1.091932,-1.454467,-1.908359,-2.748445,-3.446538,-4.576528],'cal/(mol*K)','+|-',[0.226952,0.226952,0.226952,0.226952,0.226952,0.226952,0.226952]),
-        H298 = (31.565243,'kcal/mol','+|-',0.869131),
+        H298 = (83.668243,'kcal/mol','+|-',0.869131),
         S298 = (1.433096,'cal/(mol*K)','+|-',0.350884),
     ),
     shortDesc = u"""Calculations from Hexylbenzene Library, Lawrence Lai""",
@@ -9049,8 +9049,11 @@
 
 Model Species used include:
 C1=CC=C2C=CC[CH]C2=C1
-C[C]1CC=CC2=CC=CC=C12
-CC[C]1CC=CC2=CC=CC=C12
+CC1=CC[CH]C2=CC=CC=C12
+CCC1=CC[CH]C2=CC=CC=C12
+
+Modified 10/2019 by Max Liu. Added enthalpy of H atom so that GAV predicted
+enthalpy for C1=CC=C2C=CC[CH]C2=C1 matches calculated value.
 """,
 )
 
@@ -9082,8 +9085,8 @@
 http://pubs.acs.org/doi/abs/10.1021/acs.jpca.5b05448
 
 Model Species used include:
-CC1=CC[CH]C2=CC=CC=C12
-CCC1=CC[CH]C2=CC=CC=C12
+C[C]1CC=CC2=CC=CC=C12
+CC[C]1CC=CC2=CC=CC=C12
 """,
 )