diff --git a/trimsp/src/trimspNL.F b/trimsp/src/trimspNL.F
index 83fcec1..13073fc 100644
--- a/trimsp/src/trimspNL.F
+++ b/trimsp/src/trimspNL.F
@@ -389,6 +389,7 @@ C     This part reads the input file (new format)
 C     First line: properties of projectile
          READ(11,*) Z1,M1,E0,Esig,ALPHA,ALPHASIG,EF,ESB,SHEATH,ERC
 C     Second line: simulation related parameters
+C     Ordered as: Number of particles, seed, seed, seed, initial depth, RD, depth increment, CA, KK0, KDEE1,KDEE2,IPOT
          READ(11,*) NH,RI,RI2,RI3,X0,RD,CW,CA,KK0,KK0R,KDEE1,KDEE2,IPOT
      &        ,IPOTR,IRL
 C     Third line: Number of layers
@@ -523,9 +524,11 @@ C     layers. It should be replaced!
 
 C     Checks wether depth interval is an integer denominator of layer thickness or not
 C     If not, calculated implantation profile is not correct.
+C     CW is depth increment and DX(K) is the thickness of layer K
       depth_interval_flag = 1
       DO K=1,L-1                     
          IF(.NOT.EQUAL(DX(K)/CW-DBLE(IDINT(DX(K)/CW)),0.D0)) THEN
+C     If the thickness of layer K is not an integer multiples of depth increment
             depth_interval_flag = 0
             GO TO 44
          ENDIF
@@ -2293,6 +2296,7 @@ C
       enddo
       ima = 1
  1010 ima = MIN0(ima+2,5000)
+C     I am not sure what is this file for?!
       open(20,file='edist')
       do ne=1,ima
          write(20,1020) ne,me(ne)