diff --git a/chrome/content/vimperator/buffers.js b/chrome/content/vimperator/buffers.js
index 73712577..c6066d8a 100644
--- a/chrome/content/vimperator/buffers.js
+++ b/chrome/content/vimperator/buffers.js
@@ -35,7 +35,7 @@ function Buffer() //{{{
     var zoom_manager = ZoomManager.prototype.getInstance();
     const ZOOM_INTERVAL = 25;
 
-    // initialise the zoom levels
+    // initialize the zoom levels
     zoom_manager.zoomFactors = [zoom_manager.MIN];
     for (var i = ZOOM_INTERVAL; i <= zoom_manager.MAX; i += ZOOM_INTERVAL)
         zoom_manager.zoomFactors.push(i);
@@ -220,7 +220,7 @@ function Buffer() //{{{
             // find the currently focused frame index
             // TODO: If the window is a frameset then the first _frame_ should be
             //       focused.  Since this is not the current FF behaviour,
-            //       we initalise current to -1 so the first call takes us to the
+            //       we initalize current to -1 so the first call takes us to the
             //       first frame.
             var current = -1;
             for (var i = 0; i < frames.length; i++)
diff --git a/chrome/content/vimperator/mappings.js b/chrome/content/vimperator/mappings.js
index b67b8502..e221c104 100644
--- a/chrome/content/vimperator/mappings.js
+++ b/chrome/content/vimperator/mappings.js
@@ -738,16 +738,16 @@ function Mappings() //{{{
     addDefaultMap(new Map(vimperator.modes.NORMAL, ["<C-b>", "<PageUp>", "<S-Space>"],
         function(count) { vimperator.buffer.scrollPages(-(count > 1 ? count : 1)); },
         {
-            short_help: "Scroll up a full page of the current document",
-            help: "TODO",
+            short_help: "Scroll up a full page",
+            help: "Scroll window <code class=\"argument\">[count]</code> pages Backwards (upwards) in the buffer.",
             flags: Mappings.flags.COUNT
         }
     ));
     addDefaultMap(new Map(vimperator.modes.NORMAL, ["<C-f>", "<PageDown>", "<Space>"],
         function(count) { vimperator.buffer.scrollPages(count > 1 ? count : 1); },
         {
-            short_help: "Scroll down a full page of the current document",
-            help: "TODO",
+            short_help: "Scroll down a full page",
+            help: "Scroll window <code class=\"argument\">[count]</code> pages Forwards (downwards) in the buffer.",
             flags: Mappings.flags.COUNT
         }
     ));