Clarify make install for .pro files

[ci skip]

README.md

@@ -94,8 +94,14 @@ When you save your change, then Travis CI should build and upload an AppImage fo
 
 For this to work, you need to enable Travis CI for your repository as [described here](https://travis-ci.org/getting_started) __prior to merging this__, if you haven't already done so.
 
+By default, qmake `.pro` files generated by Qt Creator unfortunately don't support `make install` out of the box. In this case you will get
 
-Note that if `qmake` does not allow for `make install` or does not install the desktop file and icon, then change it similar to https://github.com/probonopd/FeedTheMonkey/blob/master/FeedTheMonkey.pro.
+```
+make: Nothing to be done for `install'.
+find: `appdir/': No such file or directory
+```
+
+If `qmake` does not allow for `make install` or does not install the desktop file and icon, then you need to change your `.pro` file it similar to https://github.com/probonopd/FeedTheMonkey/blob/master/FeedTheMonkey.pro.
 
 ```
   - make INSTALL_ROOT=appdir install ; find appdir/