diff --git a/library/src/main/java/com/heinrichreimersoftware/materialintro/app/SlideFragment.java b/library/src/main/java/com/heinrichreimersoftware/materialintro/app/SlideFragment.java
index 36081ba..ff4d9c2 100644
--- a/library/src/main/java/com/heinrichreimersoftware/materialintro/app/SlideFragment.java
+++ b/library/src/main/java/com/heinrichreimersoftware/materialintro/app/SlideFragment.java
@@ -18,6 +18,18 @@ public void updateNavigation() {
         }
     }
 
+    public void addOnNavigationBlockedListener(OnNavigationBlockedListener listener) {
+        if (getActivity() instanceof IntroActivity) {
+            ((IntroActivity) getActivity()).addOnNavigationBlockedListener(listener);
+        }
+    }
+
+    public void removeOnNavigationBlockedListener(OnNavigationBlockedListener listener) {
+        if (getActivity() instanceof IntroActivity) {
+            ((IntroActivity) getActivity()).removeOnNavigationBlockedListener(listener);
+        }
+    }
+
     protected void nextSlide() {
         if (getActivity() instanceof IntroActivity) {
             ((IntroActivity) getActivity()).nextSlide();