diff --git a/README.md b/README.md
index 679af5a2f..ccdc7f07e 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ Prerequisites:
 
 - [Boost](http://www.boost.org/users/download/) >= 1.43 (Ubuntu: `sudo apt-get install libboost-all-dev`)
 - [CMake](http://www.cmake.org/cmake/resources/software.html) >= 2.6 (Ubuntu: `sudo apt-get install cmake`)
+- A modern compiler, i.e., at least gcc 4.7.3 on Linux.
 
 Optional prerequisites - used automatically if findable by CMake:
 
@@ -46,6 +47,6 @@ See the [`INSTALL`](INSTALL) file for more detailed installation instructions.
 
 GTSAM is open source under the BSD license, see the [`LICENSE`](LICENSE) and [`LICENSE.BSD`](LICENSE.BSD) files.
 
-Please see the [`examples/`](examples) directory and the [`USAGE`](USAGE.md) file for examples on how to use GTSAM.
-
+Please see the [`examples/`](examples) directory and the [`USAGE`](USAGE.md) file for examples on how to use GTSAM.
+
 GTSAM was developed in the lab of [Frank Dellaert](http://www.cc.gatech.edu/~dellaert) at the [Georgia Institute of Technology](http://www.gatech.edu), with the help of many contributors over the years, see [THANKS](THANKS).
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