diff --git a/pom.xml b/pom.xml
index 7c29bd36811b8eb16cf3d30ca3756f2ec563b9be..c1e8a16daf8e60d25a813c02f84b0bdbd92566a8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -175,6 +175,9 @@
     <contributor>
       <name>Espen Bj&#248;rntvedt</name>
     </contributor>
+    <contributor>
+      <name>Bryan Cazabonne</name>
+    </contributor>
     <contributor>
       <name>Paul Cefola</name>
     </contributor>
diff --git a/src/main/java/org/orekit/models/earth/EstimatedTroposphericModel.java b/src/main/java/org/orekit/models/earth/EstimatedTroposphericModel.java
index f09dbd1099df1ed1b71a076e0be909006404314a..6860d35937842fc017b2fa15c95a8683845cd2f4 100644
--- a/src/main/java/org/orekit/models/earth/EstimatedTroposphericModel.java
+++ b/src/main/java/org/orekit/models/earth/EstimatedTroposphericModel.java
@@ -75,7 +75,7 @@ public class EstimatedTroposphericModel implements DiscreteTroposphericModel {
      * @param totalDelay initial value for the tropospheric zenith total delay [m]
      */
     public EstimatedTroposphericModel(final double t0, final double p0,
-                                    final MappingFunction model, final double totalDelay) {
+                                      final MappingFunction model, final double totalDelay) {
 
         totalZenithDelay = new ParameterDriver(EstimatedTroposphericModel.TOTAL_ZENITH_DELAY,
                                                totalDelay, FastMath.scalb(1.0, 0), 0.0, Double.POSITIVE_INFINITY);
diff --git a/src/main/java/org/orekit/overview.html b/src/main/java/org/orekit/overview.html
index f8b5e7cc180e8849379a76c16dacfa8bf7ae0b9a..70561f532a3a3020e8bad74facc83d530d2d5fa5 100644
--- a/src/main/java/org/orekit/overview.html
+++ b/src/main/java/org/orekit/overview.html
@@ -209,7 +209,8 @@ discrete events. Here is a short list of the features offered by the library:</p
           <li>force model parameters estimation (drag coefficients, radiation pressure coefficients,
               central attraction, maneuver thrust or flow rate)</li>
           <li>measurements parameters estimation (biases, satellite clock offset, station clock offset,
-              station position, pole motion and rate, prime meridian correction and rate)</li>
+              station position, pole motion and rate, prime meridian correction and rate, total
+              zenith delay in tropospheric correction)</li>
         </ul>
       </li>
       <li>multi-satellites orbit determination</li>
@@ -271,7 +272,7 @@ discrete events. Here is a short list of the features offered by the library:</p
   </li>
   <li>Earth models
     <ul>
-      <li>tropospheric delay (modified Saastamoinen)</li>
+      <li>tropospheric delay (modified Saastamoinen, Mendes-Pavlis, Vienna 1, Vienna 2, estimated, fixed)</li>
       <li>tropospheric refraction correction angle (Recommendation ITU-R P.834-7 and Saemundssen's formula quoted by Meeus)</li>
       <li>tropospheric model for laser ranging (Marini-Murray)</li>
       <li>Klobuchar ionospheric model (including parsing α and β coefficients from University of Bern Astronomical Institute files)</li>
diff --git a/src/site/markdown/index.md b/src/site/markdown/index.md
index 87b17c12e53c60f006752e5228c177550011e199..e11b76d103c58fbf8eb058522336bb6f59895368 100644
--- a/src/site/markdown/index.md
+++ b/src/site/markdown/index.md
@@ -186,7 +186,8 @@
       * force model parameters estimation (drag coefficients, radiation pressure coefficients,
         central attraction, maneuver thrust or flow rate)
       * measurements parameters estimation (biases, satellite clock offset, station clock offset,
-        station position, pole motion and rate, prime meridian correction and rate)
+        station position, pole motion and rate, prime meridian correction and rate, total zenith
+        delay in tropospheric correction)
 
     * multi-satellites orbit determination
     * ground stations displacements due to solid tides
@@ -240,7 +241,7 @@
 
   * Earth models
   
-    * tropospheric delay (modified Saastamoinen)
+    * tropospheric delay (modified Saastamoinen, Mendes-Pavlis, Vienna 1, Vienna 2, estimated, fixed)
     * tropospheric refraction correction angle (Recommendation ITU-R P.834-7 and Saemundssen's formula quoted by Meeus)
     * tropospheric model for laser ranging (Marini-Murray)
     * Klobuchar ionospheric model (including parsing α and β coefficients from University of Bern Astronomical Institute files)
diff --git a/src/site/xdoc/changes.xml b/src/site/xdoc/changes.xml
index b6ab2a8f061d3bc8e7d1f6b2a63f2426a1a88cd8..8ee817a7fbfbb58fb01dbdee74717b26b78329cc 100644
--- a/src/site/xdoc/changes.xml
+++ b/src/site/xdoc/changes.xml
@@ -21,6 +21,14 @@
   </properties>
   <body>
     <release version="TBD" date="TBD" description="TBD">
+      <action dev="bryan" type="add" issue="498">
+        Added several tropospheric models: Mendes-Pavlis, Vienna 1, Vienna 3, estimated model
+        where the total zenith delay can be estimated during Orbit Determination.
+      </action>
+      <action dev="bryan" type="add" issue="498">
+        Added Global Mapping Function and Niell Mapping Function to be used with tropospheric
+        models.
+      </action>
       <action dev="luc" type="add" issue="515">
         Added clock offset parameter at satellites level for orbit determination.
       </action>