Added PBC note to comm-mode=angular warning

Change-Id: Id397d51c05512427414aa7decea55fed83ff42ac

diff --git a/src/gromacs/gmxpreprocess/readir.c b/src/gromacs/gmxpreprocess/readir.c
index 3319882e7fd9a83f913fe853fd79047e49687f8e..21ffe3021631070740375553a473667e350c31f2 100644 (file)
--- a/src/gromacs/gmxpreprocess/readir.c
+++ b/src/gromacs/gmxpreprocess/readir.c
@@ -915,7 +915,7 @@ void check_ir(const char *mdparin, t_inputrec *ir, t_gromppopts *opts,
             CHECK(ir->bPeriodicMols);
             if (ir->ePBC != epbcNONE)
             {
-                warning(wi, "Removing the rotation around the center of mass in a periodic system (this is not a problem when you have only one molecule).");
+                warning(wi, "Removing the rotation around the center of mass in a periodic system, this can lead to artifacts. Only use this on a single (cluster of) molecules. This cluster should not cross periodic boundaries.");
             }
         }
     }