diff --git a/src/applyRP.m b/src/applyRP.m
index 34df31b377067271bcb1ef431537f5d7e90ef1c5..b8d3e4e47d7e745283bcfc868bd245c561d892eb 100644
--- a/src/applyRP.m
+++ b/src/applyRP.m
@@ -1,11 +1,13 @@
 function P_Omega2 = applyRP(P_Omega)
 
-% Completes a matrix according to the symmetrie resulting from the reciprocity relation.
+%% APPLYRP: Completes a matrix according to the symmetrie resulting from the reciprocity relation.
 %
 % INPUT:    P_Omega     Projection operator corresponding to non-observable part Omega, nxhat*nd-array
 %                       with only 0 and 1 entries.
 % OUTPUT    P_Omega2    Completed version of P_Omega, nxhat*nd-array, with only 0 and 1 entries.
 %
+% SYNTAX: applyRP(P_Omega)
+%
 % *****************************************************************************************************
 
 [nxhat, nd] = size(P_Omega);