diff --git a/src/documentation/content/xdocs/faq.xml b/src/documentation/content/xdocs/faq.xml
index e74b6f090..22c1a4cb4 100644
--- a/src/documentation/content/xdocs/faq.xml
+++ b/src/documentation/content/xdocs/faq.xml
@@ -20,6 +20,36 @@
 <!DOCTYPE faqs PUBLIC "-//APACHE//DTD FAQ V1.1//EN" "./dtd/faq-v11.dtd">
 
 <faqs title="Frequently Asked Questions">
+    <faq>
+        <question>
+          My code uses some new HSSF feature, compiles fine but fails when live with a "MethodNotFoundException"
+        </question>
+		<answer>
+		 <p>You almost certainly have an older version of POI earlier 
+		 on your classpath. Quite a few runtimes and other packages 
+		 will ship an older version of POI, so this is an easy problem
+		 to hit without realising.</p>
+		 <p>The best way to identify the offending earlier jar file is
+		 with a few lines of java. These will load one of the core POI
+		 classes, and report where it came from.</p>
+		 <source>
+ClassLoader classloader = org.apache.poi.poifs.filesystem.POIFSFileSystem.class.getClassLoader();
+URL res = classloader.getResource("org/apache/poi/poifs/filesystem/POIFSFileSystem.class">
+String path = res.getPath();
+System.out.println("Core POI came from " + path);
+		 </source>
+		</answer>
+	</faq>
+    <faq>
+        <question>
+          My code uses the scratchpad, compiles fine but fails to run with a "MethodNotFoundException"
+        </question>
+		<answer>
+		 <p>You almost certainly have an older version earlier on your
+		 classpath. See the answer to the similar question above for
+		 how to track this down.</p>
+		</answer>
+	</faq>
     <faq>
         <question>
           Why is reading a simple sheet taking so long?