diff --git a/sdk/openbr_plugin.h b/sdk/openbr_plugin.h
index 0a0bd66..ca49a32 100644
--- a/sdk/openbr_plugin.h
+++ b/sdk/openbr_plugin.h
@@ -845,6 +845,7 @@ class BR_EXPORT Format : public Object
 public:
     virtual ~Format() {}
     virtual Template read() const = 0; /*!< \brief Returns a br::Template created by reading #br::Object::file. */
+    virtual void write(const Template &t) const = 0; /*!< \brief Writes the br::Template to #br::Object::file. */
 };
 
 /*!
diff --git a/sdk/plugins/format.cpp b/sdk/plugins/format.cpp
index 9e1e7b2..38fe03b 100644
--- a/sdk/plugins/format.cpp
+++ b/sdk/plugins/format.cpp
@@ -63,6 +63,12 @@ class csvFormat : public Format
 
         return Template(m);
     }
+
+    void write(const Template &t) const
+    {
+        (void) t;
+        qFatal("csvFormat::write not supported.");
+    }
 };
 
 BR_REGISTER(Format, csvFormat)
@@ -105,6 +111,12 @@ class DefaultFormat : public Format
 
         return t;
     }
+
+    void write(const Template &t) const
+    {
+        (void) t;
+        qFatal("csvFormat::write not supported.");
+    }
 };
 
 BR_REGISTER(Format, DefaultFormat)
@@ -129,6 +141,12 @@ class webcamFormat : public Format
         videoCapture->read(m);
         return Template(m);
     }
+
+    void write(const Template &t) const
+    {
+        (void) t;
+        qFatal("webcamFormat::write not supported.");
+    }
 };
 
 BR_REGISTER(Format, webcamFormat)
@@ -191,6 +209,12 @@ class xmlFormat : public Format
 
         return t;
     }
+
+    void write(const Template &t) const
+    {
+        (void) t;
+        qFatal("xmlFormat::write not supported.");
+    }
 };
 
 BR_REGISTER(Format, xmlFormat)