diff --git a/example/webdoc.conf.json b/example/webdoc.conf.json
index 01d0756c..2769e56f 100644
--- a/example/webdoc.conf.json
+++ b/example/webdoc.conf.json
@@ -1,6 +1,6 @@
 {
     "source": {
-        "includePattern": "./src/**/*"
+        "include": "./src/**/*"
     },
     "plugins": [
       "plugins/markdown"
diff --git a/packages/webdoc-cli/src/config.js b/packages/webdoc-cli/src/config.js
index b097a9ae..5f593eff 100644
--- a/packages/webdoc-cli/src/config.js
+++ b/packages/webdoc-cli/src/config.js
@@ -9,8 +9,11 @@ type ConfigSchema = {
     sort?: string
   },
   source?: {
+    // Declared in order of priority
+    include?: string | Array<string>,
     includePattern?: string | Array<string>,
-    include?: string | Array<string>
+    excludePattern?: string | Array<string>,
+    exclude?: string | Array<string>,
   },
   conf?: {
     tags?: {
@@ -52,7 +55,6 @@ const defaultConfig: ConfigSchema = {
     sort: "type, scope, access, name",                    // @webdoc/parser{mod:sort}
   },
   source: {
-    includePattern: "./**/*.js",                          // @webdoc/cli{main}
   },
   conf: {
     tags: {
@@ -103,30 +105,6 @@ export function loadConfig(file: string): ConfigSchema {
   return config;
 }
 
-export function getIncludePattern(config: ConfigSchema): string[] {
-  const source = config.source;
-
-  if (typeof source !== "undefined") {
-    if (typeof source.includePattern !== "undefined") {
-      if (Array.isArray(source.includePattern)) {
-        return source.includePattern;
-      } else if (typeof source.includePattern === "string") {
-        return [source.includePattern];
-      }
-    }
-
-    if (typeof source.include !== "undefined") {
-      if (Array.isArray(source.include)) {
-        return source.include;
-      } else if (typeof source.include === "string") {
-        return [source.include];
-      }
-    }
-  }
-
-  return [];
-}
-
 export function getTemplate(config: ConfigSchema): string {
   if (config.opts && config.opts.template) {
     return config.opts.template;
diff --git a/packages/webdoc-cli/src/index.js b/packages/webdoc-cli/src/index.js
index 606e9118..c20a85c4 100644
--- a/packages/webdoc-cli/src/index.js
+++ b/packages/webdoc-cli/src/index.js
@@ -59,7 +59,7 @@ async function main(argv: yargs.Argv) {
   global.Webdoc = global.Webdoc || {};
   registerWebdocParser();// global.Webdoc.Parser
 
-  const {loadConfig, getIncludePattern, getTemplate} = require("./config");
+  const {loadConfig, getTemplate} = require("./config");
   const config = loadConfig(argv.config);
   const tutorials = loadTutorials(argv.tutorials);
 
@@ -79,13 +79,6 @@ async function main(argv: yargs.Argv) {
   global.Webdoc.env.conf = config;
   global.Webdoc.userConfig = config;
 
-  // TODO: excludePattern
-  const includePattern = getIncludePattern(config);
-
-  if (!includePattern) {
-    console.log("No source.include or source.includePattern found in config file");
-  }
-
   if (config.plugins) {
     for (const pluginPath of config.plugins) {
       if (pluginPath === "plugins/markdown") {
diff --git a/packages/webdoc-cli/src/sources/index.js b/packages/webdoc-cli/src/sources/index.js
index 71903141..b4a32894 100644
--- a/packages/webdoc-cli/src/sources/index.js
+++ b/packages/webdoc-cli/src/sources/index.js
@@ -2,15 +2,76 @@ import type {RootDoc, SourceFile} from "@webdoc/types";
 import globby from "globby";
 import {packages} from "./packages";
 
+// Create a filtering callback that returns whether a path passes all
+// patterns (if exclude = false) or if it fails all of them (if exclude = true).
+function makePatternFilter(
+  patterns: string | string[],
+  exclude: boolean = false,
+): (path: string) => boolean {
+  const normalizedFormat = Array.isArray(patterns) ?
+    patterns :
+    ((patterns && [patterns]) || []);
+
+  if (normalizedFormat.length === 0) {
+    // If no patterns to match, then short circuit evaluation.
+    return () => true;
+  }
+
+  const regExps = normalizedFormat.map(
+    (pattern) => {
+      try {
+        return new RegExp(pattern, "g");
+      } catch (e) {
+        console.error("Invalid pattern: " + pattern +
+          "\nPlease make sure the patterns in sources.includePattern or source.excludePattern " +
+          "defined in your configuration file are valid\n",
+        );
+      }
+    },
+  );
+
+  return function(path: string): boolean {
+    for (const regExp of regExps) {
+      if (path.match(regExp)) {
+        // If include pattern matched, return true.
+        // If exclude pattern matched, return false.
+        return !exclude;
+      }
+    }
+
+    // If all include patterns failed, return false.
+    // If all exclude patterns passed, return true.
+    return exclude;
+  };
+}
+
 export function sources(config: Object, documentTree: RootDoc): SourceFile[] {
-  const includePattern = config.source.includePattern || config.source.include;
+  const {
+    include,
+    includePattern,
+    exclude,
+    excludePattern,
+  } = config.source;
 
-  if (!includePattern) {
-    console.log("No source.include or source.includePattern found in config file");
+  if (!include) {
+    console.error("No input files specified. You must " +
+      "define source.include in your configuration file.");
+
+    return [];
   }
 
-  const paths = globby.sync(includePattern);
-  const sources: SourceFile[] = paths.map((file) => ({path: file}));
+  const paths = globby.sync(include);
+  const excludePaths = Array.isArray(exclude) ?
+    exclude :
+    ((exclude && [exclude]) || []);
+
+  const sources: SourceFile[] = paths
+    .filter(makePatternFilter(includePattern, false))
+    .filter(makePatternFilter(excludePattern, true))
+    .filter((path) => !(excludePaths.some(
+      (excludedPath) => path === excludePaths,
+    )))
+    .map((path) => ({path}));
 
   documentTree.packages = packages(sources);