diff --git a/midori/midori-extension.c b/midori/midori-extension.c
index 2815634..2794dda 100644
--- a/midori/midori-extension.c
+++ b/midori/midori-extension.c
@@ -136,6 +136,7 @@ enum {
     ACTIVATE,
     DEACTIVATE,
     OPEN_PREFERENCES,
+    SETTING_CHANGED,
 
     LAST_SIGNAL
 };
@@ -203,6 +204,24 @@ midori_extension_class_init (MidoriExtensionClass* class)
         G_TYPE_NONE, 0,
         G_TYPE_NONE);
 
+    /**
+     * MidoriExtension::setting-changed:
+     *
+     * A setting has changed.
+     *
+     * Since: 0.4.6
+     */
+     signals[SETTING_CHANGED] = g_signal_new (
+        "setting-changed",
+        G_TYPE_FROM_CLASS (class),
+        (GSignalFlags)(G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION),
+        0,
+        0,
+        NULL,
+        g_cclosure_marshal_VOID__STRING,
+        G_TYPE_NONE, 1,
+        G_TYPE_STRING);
+
     gobject_class = G_OBJECT_CLASS (class);
     gobject_class->finalize = midori_extension_finalize;
     gobject_class->set_property = midori_extension_set_property;
@@ -749,6 +768,7 @@ midori_extension_set_boolean (MidoriExtension* extension,
             g_error_free (error);
         }
     }
+    g_signal_emit (extension, signals[SETTING_CHANGED], 0, name);
 }
 
 /**
@@ -846,6 +866,7 @@ midori_extension_set_integer (MidoriExtension* extension,
             g_error_free (error);
         }
     }
+    g_signal_emit (extension, signals[SETTING_CHANGED], 0, name);
 }
 
 /**
@@ -943,6 +964,7 @@ midori_extension_set_string (MidoriExtension* extension,
             g_error_free (error);
         }
     }
+    g_signal_emit (extension, signals[SETTING_CHANGED], 0, name);
 }
 
 /**
@@ -1055,4 +1077,5 @@ midori_extension_set_string_list (MidoriExtension* extension,
             g_error_free (error);
         }
     }
+    g_signal_emit (extension, signals[SETTING_CHANGED], 0, name);
 }