Update documentation examples.

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/layout-of-source-files.rst b/docs/layout-of-source-files.rst
index 4bacd704..5cbb6cff 100644
--- a/docs/layout-of-source-files.rst
+++ b/docs/layout-of-source-files.rst
@@ -204,7 +204,7 @@ for the two input parameters and two returned values.
           * @return s The calculated surface.
           * @return p The calculated perimeter.
           */
-        function rectangle(uint w, uint h) public returns (uint s, uint p) {
+        function rectangle(uint w, uint h) public pure returns (uint s, uint p) {
             s = w * h;
             p = 2 * (w + h);
         }