diff --git a/README.md b/README.md
index 5496b95..fbfb87b 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,15 @@ make
 (optional) make install
 ```
 
+Optional configuration features (aka ./configure options):
+```
+  --disable-optimization  disable compiler optimizations (change from -O2 to -O0)
+  --enable-debug	  enable debug info (add "-g -DDEBUG" to CFLAGS)
+  --enable-asan		  enable AddressSanitizer and other checks
+	add "-fsanitize=address,undefined,leak -Wformat -Werror=format-security -Werror=array-bounds" to CFLAGS
+	use libasan with GCC and embedded ASAN with Clang
+```
+
 ## Contributing
 
 The contributing policy is simple. If you have a patch to propose, make a pull-request