Added a note that running in double precision is slower.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a89e91d991abd090879a70fc31dbd9070e3f629a..1aaf0022ad89038919582a412160dbe2e6478f9b 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -76,7 +76,7 @@ gmx_c_flags()
 ########################################################################
 # User input options                                                   #
 ########################################################################
-option(GMX_DOUBLE "Use double precision" OFF)
+option(GMX_DOUBLE "Use double precision. Much slower, use only if needed!)" OFF)
 option(GMX_MPI    "Build a parallel (message-passing) version of GROMACS" OFF)
 option(GMX_THREADS    "Build a parallel (thread-based) version of GROMACS)" ON)
 option(GMX_SOFTWARE_INVSQRT "Use GROMACS software 1/sqrt" ON)