diff --git a/lib/Epub/Epub.cpp b/lib/Epub/Epub.cpp
index 64727bca..65cfd4b0 100644
--- a/lib/Epub/Epub.cpp
+++ b/lib/Epub/Epub.cpp
@@ -349,7 +349,7 @@ const std::string& Epub::getAuthor() const {
 }
 
 std::string Epub::getCoverBmpPath(bool cropped) const {
-  const auto coverFileName = "cover" + cropped ? "_crop" : "";
+  const auto coverFileName = std::string("cover") + (cropped ? "_crop" : "");
   return cachePath + "/" + coverFileName + ".bmp";
 }
 
diff --git a/lib/GfxRenderer/GfxRenderer.cpp b/lib/GfxRenderer/GfxRenderer.cpp
index e94ea460..ebcbfe23 100644
--- a/lib/GfxRenderer/GfxRenderer.cpp
+++ b/lib/GfxRenderer/GfxRenderer.cpp
@@ -232,9 +232,10 @@ void GfxRenderer::drawBitmap(const Bitmap& bitmap, const int x, const int y, con
       drawVal(screenX, screenY, val);
 
       // draw extended pixels
-      /// amount of pixels taken from bitmap and repeated to extend
+      // amount of pixels taken from bitmap and repeated to extend.
+      // Trade-off between risk of repeating "edgy" content like text and more quality
       int extendY = 20;
-      int extendX = 20;  // The width of the strip to be mirrored
+      int extendX = 20;
       int drawExtY = 0;
       if (extend) {
         int imgHeight = std::floor(scale * (bitmap.getHeight() - cropPixY));