diff --git a/src/backend/jit/README b/src/backend/jit/README
index bfed319189..dca4aa761c 100644
--- a/src/backend/jit/README
+++ b/src/backend/jit/README
@@ -55,6 +55,9 @@ unlikely to be discontinued, because it has a license compatible with
 PostgreSQL, and because its LLVM IR can be generated from C
 using the clang compiler.
 
+clang will be used to compile files where LLVM bitcode is required to
+inline functions using the -emit-llvm flag. This may cause PostgreSQL
+to be compiled with multiple compilers, such as gcc and clang.
 
 Shared Library Separation
 -------------------------