diff --git a/README.md b/README.md
index 9e1f831..430f6e3 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ A couple of custom-designed and manufactured plastic parts create a scanning bed
 
 Unlike an optical microscope, where the entirely of an object is imaged at once, a scanning laser microscope takes light intensity measurements in increments, moving across an object in a grid and assembling a magnified image pixel by pixel. 
 A browser-based user interface written in HTML an Java Script allows to operate the device over WLAN.
-<img src="./images/onion480x480.png">*Web interface of Blu-ray microscope, showing onion cells*</img>
+<img src="./images/onion480x480.PNG">*Web interface of Blu-ray microscope, showing onion cells*</img>
 
 ---
 ## Preparing The Microscope
@@ -46,4 +46,4 @@ Part 2 is about a working prototype that builds on the existing CD/DVD/Blu-ray d
 Part 3 shows how to build an improved version of the microscope from 3D printed parts and how to use it.  
 <a href="https://youtu.be/xfuWbnMYOos" alt="DIY Blu-Ray Laser Scanning Microscope #3: Improvements And Tests">
 <img width="560" height="315" src="./images/part3.webp"></img>
-</a>
\ No newline at end of file
+</a>