diff --git a/build.xml b/build.xml
index 2f7a4fc..fd44fc0 100644
--- a/build.xml
+++ b/build.xml
@@ -81,7 +81,7 @@
         <dirname property="mac.src.dir" file="mac/PortableSigner.app"/>
         <dirname property="mac.lib.dir" file="${dist.jar.dir}/PortableSigner.app/Contents/Resources/Java/javadir.empty"/>
         <dirname property="linux.src.dir" file="linux"/>
-        <copy file="Readme.txt" todir="${dist.jar.dir}" overwrite="true"/>
+        <copy file="readme.md" todir="${dist.jar.dir}" overwrite="true"/>
         <copy todir="${dist.jar.dir}">
             <fileset dir="${mac.src.dir}">
                 <include name="PortableSigner.app/"/>