Update TESTING.md
diff --git a/TESTING.md b/TESTING.md
index ba9e32f..f99ba7c 100644
--- a/TESTING.md
+++ b/TESTING.md
@@ -25,6 +25,11 @@
### Run tests with asan
```shell
+# For nice symbols tell asan how to symoblize. Note that it doesn't like versioned copies like llvm-symbolizer-3.8
+# export ASAN_SYMBOLIZER_PATH=path to version-less llvm-symbolizer
+# ex
+export ASAN_SYMBOLIZER_PATH=/usr/lib/llvm-3.8/bin/llvm-symbolizer
+
./configure CC=clang CXX=clang++ CPPFLAGS=-fsanitize=address LDFLAGS=-fsanitize=address
# make/run tests as usual
```
