diff --git a/build.sh b/build.sh
index 27f1b08..0db3d50 100644
--- a/build.sh
+++ b/build.sh
@@ -3,6 +3,8 @@
 VERSION="zombiereloaded-3.0-b2"
 REVISION=$(hg id -n)
 
+SYNTAX="Usage: $0 [--patch <base rev>]"
+
 # Source paths
 BUILDDIR=build
 PLUGINFILE=zombiereloaded.smx
@@ -21,22 +23,19 @@ ZIPFILE=$VERSION-r$REVISION.zip
 
 MAKEPATCH=false
 
-
 # Clean build and release directory.
 make clean
 rm -rf $RELEASEDIR
 echo "Cleaned build and release directory."
 
-
 # Exit if cleaning only.
-if [ "$1" = "clean" ]
+if [ "$1" = "--clean" ]
 then
     exit 0
 fi
 
-
 # Check if patch mode is enabled.
-if [ "$1" = "patch" ]
+if [ "$1" = "--patch" ]
 then
     if [ "$2" ]
     then
@@ -51,44 +50,27 @@ then
         
         ZIPFILE=$VERSION-patch-r$PATCHREV-r$REVISION.zip
     else
-        echo "Missing base revision number. Usage: build.sh patch <base rev>"
+        echo "Missing base revision number. $SYNTAX"
         exit 1
     fi
 fi
 
-
 # Make release directory.
 mkdir -p $RELEASEDIR
 
-
 # Compile plugin.
 make
 
-
 # Check if the plugin is built.
 if [ ! -e $BUILDDIR/$PLUGINFILE ]
 then
-    echo "Cannot build release package, plugin build failed. Missing file '$BUILDDIR/$PLUGINFILE'."
+    echo "Cannot build release package, plugin build failed. Missing file $BUILDDIR/$PLUGINFILE."
     exit 1
 fi
 
 # Rebuild hgversion.h.inc for unofficial builds.
 sh updateversion.sh --unofficial
 
-
-# Copy files.
-echo "Copying documentation..."
-mkdir -p $DOCS_DEST
-cp -r $DOCS $DOCS_DEST
-
-echo "Copying plugin binary..."
-mkdir -p $PLUGINDIR
-cp -r $BUILDDIR/$PLUGINFILE $PLUGINDIR/$PLUGINFILE
-
-echo "Copying plugin source code..."
-mkdir -p $SOURCE_DEST
-cp -r $SOURCEDIR $SOURCE_DEST
-
 if [ $MAKEPATCH = "false" ]
 then
     # Copy all files.
@@ -100,6 +82,9 @@ then
     cp $ZRTOOLS_SOURCE/zrtools.ext.so $EXTENSIONDIR
     cp $ZRTOOLS_SOURCE/zrtools.ext.dll $EXTENSIONDIR
 else
+    # Make diff file with changes since base revision.
+    sh changes.sh $PATCHREV "tip"
+    
     # Copy only changed files.
     CHANGEDFILES=$(hg status --rev $PATCHREV | grep "cstrike/" | cut -d ' ' -f2 | cut -d '/' -f2-)
     
@@ -109,6 +94,18 @@ else
     cd ..
 fi
 
+# Copy  files.
+echo "Copying plugin binary..."
+mkdir -p $PLUGINDIR
+cp -r $BUILDDIR/$PLUGINFILE $PLUGINDIR/$PLUGINFILE
+
+echo "Copying plugin source code..."
+mkdir -p $SOURCE_DEST
+cp -r $SOURCEDIR $SOURCE_DEST
+
+echo "Copying documentation..."
+mkdir -p $DOCS_DEST
+cp -r $DOCS $DOCS_DEST
 
 # Make release package.
 echo "Compressing files..."
diff --git a/changes.sh b/changes.sh
new file mode 100644
index 0000000..b7bb3c3
--- /dev/null
+++ b/changes.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+SYNTAX="Usage: $0 <base rev> <target rev>"
+
+if [ "$1" ]
+then
+    BASEREV="$1"
+    
+    if [ "$2" ]
+    then
+        TARGETREV="$2"
+    else
+        echo "Missing target revision. $SYNTAX"
+        exit 1
+    fi
+else
+    echo "$SYNTAX"
+    exit 1
+fi
+
+hg diff -r $BASEREV -r $TARGETREV cstrike/cfg/* cstrike/addons/sourcemod/* > docs/changes.diff