diff --git a/tracy/tracy/src/soleillib.cc b/tracy/tracy/src/soleillib.cc
index e783b0cc859b07b51a2f4f0075c91425bef5fcd6..f598114671795072d4d0dd95c3b477588bdff61e 100644
--- a/tracy/tracy/src/soleillib.cc
+++ b/tracy/tracy/src/soleillib.cc
@@ -1101,13 +1101,13 @@ void fmap(long Nbx, long Nbz, long Nbtour, double xmax, double zmax,
        Results in fmapdp.out
 
    Input:
-       Nbx    horizontal step number
-       Nbe        energy step number
-       Nbdp   energy step number
-       xmax   horizontal maximum amplitude
-       emax   energy
-       z      vertical starting amplitude
-       Nbtour number of turn for tracking
+       Nbx              horizontal step number
+       Nbe              energy step number
+       Nbtour           number of turns for tracking
+       xmax             horizontal maximum amplitude
+       emax             maximum energy
+       z                vertical amplitude
+       diffusion        flag to calculate tune diffusion
        matlab  set file print format for matlab post-process; specific for nsrl-ii
    Output:
        status true if stable