diff --git a/src/adapters/github.js b/src/adapters/github.js
index c39a49c..ef08ee8 100644
--- a/src/adapters/github.js
+++ b/src/adapters/github.js
@@ -180,7 +180,7 @@ class GitHub extends PjaxAdapter {
    */
    _getPatch(opts, cb) {
     const {pullNumber} = opts.repo
-    this._get(`/pulls/${pullNumber}/files`, opts, (err, res) => {
+    this._get(`/pulls/${pullNumber}/files?per_page=300`, opts, (err, res) => {
       if (err) cb(err)
       else {
         const diffMap = {}
diff --git a/src/styles/base.less b/src/styles/base.less
index df9e7a3..7327885 100755
--- a/src/styles/base.less
+++ b/src/styles/base.less
@@ -169,6 +169,11 @@
         height: 60px;
       }
     }
+    .octotree_opts_disclaimer {
+      color: gray;
+      display: block;
+      font-size: 12px;
+    }
   }
 }
 
diff --git a/src/template.html b/src/template.html
index 14048b8..d1b649d 100644
--- a/src/template.html
+++ b/src/template.html
@@ -80,7 +80,11 @@
           </div>
 
           <div class="octotree_github_only">
-            <label><input type="checkbox" data-store="PR"> Show only changes in pull requests</label>
+            <label>
+              <input type="checkbox" data-store="PR">
+                Show only changes in pull requests
+              <span class="octotree_opts_disclaimer">Note: displays a maximum of 300 files</span>
+            </label>
           </div>
 
           <div>