diff --git a/README.md b/README.md
index 3de3696..d70c5c3 100644
--- a/README.md
+++ b/README.md
@@ -59,8 +59,12 @@ additional information on stdout.
 
 Installation
 ------------
-To build the library and associated demos/tests, type `make`. Type
-`make install` to install the library, header file and camera demos.
+To build the library and associated demos/tests, type `make`. If you need to
+decode "large" image files build with `CFLAGS="-DQUIRC_MAX_REGIONS=65534" make`
+instead. Note that this will increase the memory usage, it is discouraged for
+low resource devices (i.e. embedded).
+
+Type `make install` to install the library, header file and camera demos.
 
 You can specify one or several of the following targets if you don't want, or
 are unable to build everything: