diff --git a/java/ql/lib/ext/com.google.gson.model.yml b/java/ql/lib/ext/com.google.gson.model.yml
index 96f5355b2dc..7b41b57083a 100644
--- a/java/ql/lib/ext/com.google.gson.model.yml
+++ b/java/ql/lib/ext/com.google.gson.model.yml
@@ -26,7 +26,12 @@ extensions:
       - ["com.google.gson", "JsonElement", True, "getAsJsonPrimitive", "()", "", "Argument[this]", "ReturnValue", "taint", "manual"]
       - ["com.google.gson", "JsonElement", True, "getAsString", "()", "", "Argument[this]", "ReturnValue", "taint", "manual"]
       - ["com.google.gson", "JsonElement", True, "toString", "()", "", "Argument[this]", "ReturnValue", "taint", "manual"]
-      - ["com.google.gson", "JsonArray", True, "add", "", "", "Argument[0]", "Argument[this].Element", "value", "manual"]
+      - ["com.google.gson", "JsonArray", True, "add", "(Boolean)", "", "Argument[0]", "Argument[this].Element", "taint", "manual"]
+      - ["com.google.gson", "JsonArray", True, "add", "(Character)", "", "Argument[0]", "Argument[this].Element", "taint", "manual"]
+      - ["com.google.gson", "JsonArray", True, "add", "(JsonElement)", "", "Argument[0]", "Argument[this].Element", "value", "manual"]
+      - ["com.google.gson", "JsonArray", True, "add", "(Number)", "", "Argument[0]", "Argument[this].Element", "taint", "manual"]
+      - ["com.google.gson", "JsonArray", True, "add", "(String)", "", "Argument[0]", "Argument[this].Element", "taint", "manual"]
+      - ["com.google.gson", "JsonArray", True, "addAll", "(JsonArray)", "", "Argument[0].Element", "Argument[this].Element", "value", "manual"]
       - ["com.google.gson", "JsonArray", True, "asList", "", "", "Argument[this].Element", "ReturnValue.Element", "value", "manual"]
       - ["com.google.gson", "JsonArray", True, "get", "", "", "Argument[this].Element", "ReturnValue", "value", "manual"]
       - ["com.google.gson", "JsonArray", True, "set", "", "", "Argument[1]", "Argument[this].Element", "value", "manual"]
diff --git a/java/ql/test/library-tests/frameworks/gson/Test.java b/java/ql/test/library-tests/frameworks/gson/Test.java
index eb3e1e526f0..6fa1fd2a1e5 100644
--- a/java/ql/test/library-tests/frameworks/gson/Test.java
+++ b/java/ql/test/library-tests/frameworks/gson/Test.java
@@ -25,7 +25,7 @@ public class Test {
 	<K> K getMapKeyDefault(Map.Entry<K,?> container) { return container.getKey(); }
 	JsonElement getMapValueDefault(JsonObject container) { return container.get(null); }
 	<V> V  getMapValueDefault(Map.Entry<?,V> container) { return container.getValue(); }
-	JsonArray newWithElementDefault(String element) { JsonArray a = new JsonArray(); a.add(element); return a; }
+	JsonArray newWithElementDefault(JsonElement element) { JsonArray a = new JsonArray(); a.add(element); return a; }
 	JsonObject newWithMapKeyDefault(String key) { JsonObject o = new JsonObject(); o.add(key, (JsonElement) null); return o; }
 	JsonObject newWithMapValueDefault(JsonElement element) { JsonObject o = new JsonObject(); o.add(null, element); return o; }
 	Object source() { return null; }
@@ -232,51 +232,58 @@ public class Test {
 			sink(out); // $ hasTaintFlow
 		}
 		{
-			// "com.google.gson;JsonArray;true;add;;;Argument[0];Argument[this].Element;value;manual"
+			// "com.google.gson;JsonArray;true;add;(Boolean);;Argument[0];Argument[this].Element;taint;manual"
 			JsonArray out = null;
 			Boolean in = (Boolean)source();
 			out.add(in);
-			sink(getElement(out)); // $ hasValueFlow
+			sink(getElement(out)); // $ hasTaintFlow
 		}
 		{
-			// "com.google.gson;JsonArray;true;add;;;Argument[0];Argument[this].Element;value;manual"
+			// "com.google.gson;JsonArray;true;add;(Character);;Argument[0];Argument[this].Element;taint;manual"
 			JsonArray out = null;
 			Character in = (Character)source();
 			out.add(in);
-			sink(getElement(out)); // $ hasValueFlow
+			sink(getElement(out)); // $ hasTaintFlow
 		}
 		{
-			// "com.google.gson;JsonArray;true;add;;;Argument[0];Argument[this].Element;value;manual"
+			// "com.google.gson;JsonArray;true;add;(JsonElement);;Argument[0];Argument[this].Element;value;manual"
 			JsonArray out = null;
 			JsonElement in = (JsonElement)source();
 			out.add(in);
 			sink(getElement(out)); // $ hasValueFlow
 		}
 		{
-			// "com.google.gson;JsonArray;true;add;;;Argument[0];Argument[this].Element;value;manual"
+			// "com.google.gson;JsonArray;true;add;(Number);;Argument[0];Argument[this].Element;taint;manual"
 			JsonArray out = null;
 			Number in = (Number)source();
 			out.add(in);
-			sink(getElement(out)); // $ hasValueFlow
+			sink(getElement(out)); // $ hasTaintFlow
 		}
 		{
-			// "com.google.gson;JsonArray;true;add;;;Argument[0];Argument[this].Element;value;manual"
+			// "com.google.gson;JsonArray;true;add;(String);;Argument[0];Argument[this].Element;taint;manual"
 			JsonArray out = null;
 			String in = (String)source();
 			out.add(in);
+			sink(getElement(out)); // $ hasTaintFlow
+		}
+		{
+			// "com.google.gson;JsonArray;true;addAll;(JsonArray);;Argument[0].Element;Argument[this].Element;value;manual"
+			JsonArray out = null;
+			JsonArray in = newWithElementDefault((JsonElement) source());
+			out.addAll(in);
 			sink(getElement(out)); // $ hasValueFlow
 		}
 		{
 			// "com.google.gson;JsonArray;true;asList;;;Argument[this].Element;ReturnValue.Element;value;manual"
 			List out = null;
-			JsonArray in = (JsonArray)newWithElementDefault((String) source());
+			JsonArray in = newWithElementDefault((JsonElement) source());
 			out = in.asList();
 			sink(getElement(out)); // $ hasValueFlow
 		}
 		{
 			// "com.google.gson;JsonArray;true;get;;;Argument[this].Element;ReturnValue;value;manual"
 			JsonElement out = null;
-			JsonArray in = (JsonArray)newWithElementDefault((String) source());
+			JsonArray in = newWithElementDefault((JsonElement) source());
 			out = in.get(0);
 			sink(out); // $ hasValueFlow
 		}