Update README.md

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README.md

@@ -19,5 +19,5 @@ ds9 /patchToFITSfile/file.fits -xpa unix -regions shape box -scale limits -0.001
 Create a box- or circle shaped region and simply press 'x' to save it as both FITS and 16-bit png files. ds9crop will try to connect via [XPA server](https://fossies.org/linux/ds9/xpa/doc/server.html) to DS9 instance to fetch curent scale limits. If this won't work, <-0.001, 0.01> will be set in saved png file and both popup windows.
 
 <p align="center">
-  <img alt="Eagle Nebula from Hubble Space Telescope, 656 nm filter" src="https://user-images.githubusercontent.com/45330694/214798789-aa419afd-2102-4370-994a-f758edfeee9a.jpg" />
+  <img alt="Eagle Nebula from Hubble Space Telescope, 656 nm filter, source: https://noirlab.edu/public/products/education/edu008/" src="https://user-images.githubusercontent.com/45330694/214798789-aa419afd-2102-4370-994a-f758edfeee9a.jpg" />
 </p>