Update README.md

README.md

@@ -13,7 +13,7 @@ The top level directory structure groups source code and input files as follow:
 | ```CHECKOUT_code```  | script to download necessary source for proper build GFDL's SHield and FV3 Solo models |
 | ```Build/```         | contains scripts used for building models listed above |
 | ```mkmf/```          | submodule entry point for the externally managed [mkmf software](https://github.com/NOAA-GFDL/mkmf) |
-| ```RTS/```           | contains scripts for use in CI software regression testing (see [RTS/README.md](https://github.com/NOAA-GFDL/SHiELD_build/RTS/README.md))|
+| ```RTS/```           | contains scripts for use in CI software regression testing (see [RTS/README.md](https://github.com/NOAA-GFDL/SHiELD_build/blob/main/RTS/README.md))|
 | ```site/```          | contains site specific scripts and compiler make templates |
 
 # Compiling