Update README.md

kaznak · Jan 19, 2025 · b04b319 · b04b319
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diff --git a/pgrx-build/README.md b/pgrx-build/README.md
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 - [pgrx](https://github.com/pgcentralfoundation/pgrx)
 
+build environment for extensions based on pgrx.
+
+pgrx gets the build target from pg_config, so it needs to be built with the image of the target to be installed.
+
 ## Usage
 
 - mount source tree to `/checkout`