diff --git a/documentation/sdk-manual/sdk-working-projects.xml b/documentation/sdk-manual/sdk-working-projects.xml
index 2f8132577d..1bc3149079 100644
--- a/documentation/sdk-manual/sdk-working-projects.xml
+++ b/documentation/sdk-manual/sdk-working-projects.xml
@@ -69,7 +69,7 @@
                                 </literallayout>
                                 </para></listitem>
                             <listitem><para>
-                                For <filename>configure.in</filename>,
+                                For <filename>configure.ac</filename>,
                                 include these lines:
                                 <literallayout class='monospaced'>
      AC_INIT(hello,0.1)