diff --git a/include/cantera/thermo/HMWSoln.h b/include/cantera/thermo/HMWSoln.h
index 938906c9f..7cab3bf46 100644
--- a/include/cantera/thermo/HMWSoln.h
+++ b/include/cantera/thermo/HMWSoln.h
@@ -1302,6 +1302,7 @@ public:
      *
      * @param testProb Hard -coded test problem to instantiate.
      *                 Current valid values are 1.
+     * @deprecated To be refactored into a standalone test
      */
     HMWSoln(int testProb);
 
diff --git a/include/cantera/thermo/MargulesVPSSTP.h b/include/cantera/thermo/MargulesVPSSTP.h
index 4468919ff..3673c156f 100644
--- a/include/cantera/thermo/MargulesVPSSTP.h
+++ b/include/cantera/thermo/MargulesVPSSTP.h
@@ -300,6 +300,7 @@ public:
      *  @param testProb Hard-coded value. Only the value of 1 is used. It's
      *                  for a LiKCl system test to predict the eutectic and
      *                  liquidus correctly.
+     *  @deprecated To be refactored into a standalone test
      */
     MargulesVPSSTP(int testProb);
 
diff --git a/include/cantera/thermo/MixedSolventElectrolyte.h b/include/cantera/thermo/MixedSolventElectrolyte.h
index d8928fd02..15e9f4b72 100644
--- a/include/cantera/thermo/MixedSolventElectrolyte.h
+++ b/include/cantera/thermo/MixedSolventElectrolyte.h
@@ -295,6 +295,7 @@ public:
      *  @param testProb Hard-coded value. Only the value of 1 is used. It's
      *                  for a LiKCl system -> test to predict the eutectic and
      *                  liquidus correctly.
+     *  @deprecated To be refactored into a standalone test
      */
     MixedSolventElectrolyte(int testProb);
 
diff --git a/include/cantera/thermo/PhaseCombo_Interaction.h b/include/cantera/thermo/PhaseCombo_Interaction.h
index 15afa2044..cd43cdcdc 100644
--- a/include/cantera/thermo/PhaseCombo_Interaction.h
+++ b/include/cantera/thermo/PhaseCombo_Interaction.h
@@ -368,6 +368,7 @@ public:
      *  @param testProb Hard-coded value. Only the value of 1 is used. It's
      *                  for a LiKCl system -> test to predict the eutectic and
      *                  liquidus correctly.
+     *  @deprecatedu unimplemented
      */
     PhaseCombo_Interaction(int testProb);
 
diff --git a/include/cantera/thermo/RedlichKisterVPSSTP.h b/include/cantera/thermo/RedlichKisterVPSSTP.h
index 84b77d43b..1cbfc0dc4 100644
--- a/include/cantera/thermo/RedlichKisterVPSSTP.h
+++ b/include/cantera/thermo/RedlichKisterVPSSTP.h
@@ -292,6 +292,7 @@ public:
      *  @param testProb Hard-coded value. Only the value of 1 is used. It's
      *                  for a LiKCl system -> test to predict the eutectic and
      *                  liquidus correctly.
+     *  @deprecated To be refactored into a standalone test
      */
     RedlichKisterVPSSTP(int testProb);
 
diff --git a/include/cantera/thermo/RedlichKwongMFTP.h b/include/cantera/thermo/RedlichKwongMFTP.h
index 9f514aebf..11f4f8ba3 100644
--- a/include/cantera/thermo/RedlichKwongMFTP.h
+++ b/include/cantera/thermo/RedlichKwongMFTP.h
@@ -65,6 +65,7 @@ public:
      *
      * @param testProb Hard -coded test problem to instantiate.
      *                 Current valid values are 1.
+     * @deprecated To be refactored into a standalone test
      */
     RedlichKwongMFTP(int testProb);