diff --git a/README.rst b/README.rst
index d87e2f646be6b38024796f3058582634ea91c535..e40c5d7ae7229dea2e6a3d726e87836ca21d419b 100644
--- a/README.rst
+++ b/README.rst
@@ -239,9 +239,10 @@ Frequently asked questions
 - How long does the compilation take?
 
   This depends on the hardware. A few hours are typical per toolchain. If a
-  second toolchain is compiled in the same MPSD software instance it is likely to
-  be faster, in particular if the same compiler is used (and thus the compiler
-  does not need to be re-compiled for the second toolchain).
+  second toolchain is compiled in the same MPSD software instance and the same
+  MPSD release it is likely to be faster, in particular if the same compiler is
+  used (and thus the compiler does not need to be re-compiled for the second
+  toolchain).
 
 - How much disk storage do I need?