diff --git a/doc/src/compute_sna_atom.txt b/doc/src/compute_sna_atom.txt
index ab652daf830d485fc3b57aeb9f8bde10c8bb61ac..efbf2e9ea393055fd850856de464234b1f2476e1 100644
--- a/doc/src/compute_sna_atom.txt
+++ b/doc/src/compute_sna_atom.txt
@@ -24,7 +24,7 @@ twojmax = band limit for bispectrum components (non-negative integer) :l
 R_1, R_2,... = list of cutoff radii, one for each type (distance units) :l
 w_1, w_2,... = list of neighbor weights, one for each type  :l
 zero or more keyword/value pairs may be appended :l
-keyword = {diagonal} or {rmin0} or {switchflag} or {bzeroflag} or {quadraticflag}:l
+keyword = {diagonal} or {rmin0} or {switchflag} or {bzeroflag} or {quadraticflag} :l
   {diagonal} value = {0} or {1} or {2} or {3}
      {0} = all j1, j2, j <= twojmax, j2 <= j1
      {1} = subset satisfying j1 == j2