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-rw-r--r--docs/building.md4
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/building.md b/docs/building.md
index 2b2435302..d86b80205 100644
--- a/docs/building.md
+++ b/docs/building.md
@@ -101,6 +101,10 @@ There are several options for getting llvm-support:
- You can set `SLANG_SLANG_LLVM_BINARY_URL` to point to a local
`libslang-llvm.so/slang-llvm.dll` or set it to a URL of an zip/archive
containing such a file
+ - If this isn't set then the build system tries to download it from the
+ release on github matching the current tag. If such a tag doesn't exist
+ or doesn't have the correct os*arch combination then the latest release
+ will be tried.
- Use a system supplied LLVM: `-DSLANG_SLANG_LLVM_FLAVOR=USE_SYSTEM_LLVM`, you
must have llvm-13.0 and a matching libclang installed. It's important that
either: