installation-instructions.md

@@ -178,7 +178,7 @@ $ make install
 ```
 The `--prefix` is necessary only so that non-python-related parts are installed in the correct place.
 
-**Important:** It is important that the boost-python dependency is compiled against the same Python version that is used in the virtualenv.
+**Important:** The boost-python dependency **must** be compiled against the same Python version that is used in the virtualenv.
 
 ## Memory requirements for compilation