diff --git a/README.md b/README.md
index d1177ca0..f7b6de23 100644
--- a/README.md
+++ b/README.md
@@ -63,9 +63,10 @@ To compile:
 
 The following flags can be passed to `cmake`:
 
-- `-DWITH_SERVER=1` Build the server
-- `-DWITH_CLIENT=0` Do not build the client
-- `-DWITH_ORACLE=0` Do not build Oracle
+- `-DWITH_SERVER=1` Build the server.
+- `-DWITH_CLIENT=0` Do not build the client.
+- `-DWITH_ORACLE=0` Do not build oracle.
+- `-DPORTABLE=1` Build portable versions of client & oracle.
 - `-DWITH_QT4=1` Force compilation to use Qt4 instead of Qt5.
 - `-DCMAKE_BUILD_TYPE=Debug` Compile in debug mode. Enables extra logging output, debug symbols, and much more verbose compiler warnings.
 - `-DUPDATE_TRANSLATIONS=1` Configure `make` to update the translation .ts files for new strings in the source code. Note: Running `make clean` will remove the .ts files.