diff --git a/man/psd.Rd b/man/psd.Rd
index cf8a2d3..c8a07a1 100644
--- a/man/psd.Rd
+++ b/man/psd.Rd
@@ -4,9 +4,11 @@
 \title{ Soil Pore Size Distribution }
 
 \description{ The unimodal soil pore size distribution based on van Genuchten's model. }
+
 \usage{
 psd(thetaS, thetaR, alpha, n, h)
 }
+
 \arguments{
   \item{thetaS}{ the water content at saturation. }
   \item{thetaR}{ the residual water content. }
@@ -14,25 +16,33 @@ psd(thetaS, thetaR, alpha, n, h)
   \item{n}{ the shape parameter in van Genuchten's formula. }
   \item{h}{ a vector of water tension (hPa) on the range of water retention curve. }
 }
+
 \value{ A numeric vector containing the soil pore size distribution as a function of soil water tension. }
+
 \author{ Renato Paiva de Lima <renato_agro_@hotmail.com> }
+
 \references{
 Ghiberto, P. J., Imhoff, S., Libardi, P. L., Silva, A. P. D., Tormena, C. A., Pilatti, M. A. (2015). 
 Soil physical quality of Mollisols quantified by a global index. \emph{Scientia Agricola}, 72(2):167-174.
-Asgarzadeh, H., Mosaddeghi, M. R., Nikbakht, A. M. (2014). 
-SAWCal: A user-friendly program for calculating soil available water quantities and physical quality indices. \emph{Computers and Electronics in Agriculture}, 109:86-93.
+
+Asgarzadeh, H., Mosaddeghi, M. R., Nikbakht, A. M. (2014). SAWCal: A user-friendly program for 
+calculating soil available water quantities and physical quality indices. 
+\emph{Computers and Electronics in Agriculture}, 109:86-93.
 }
+
 \examples{
 # EXAMPLE 1
 x <- seq(log10(1),log10(15000),len=100)
 h <- 10^x
 y <- psd(thetaR = 0.15,thetaS = 0.55, alpha = 0.048, n = 1.5, h=h)
 plot(x=h,y=y, log="x", xlab="h (hPa)", ylab=expression(delta*theta/delta*h), ylim=c(0,0.005))
+
 # EXAMPLE 2
 x <- seq(log10(1),log10(15000),len=100)
 h <- 10^x
 y <- psd(thetaR = 0.20,thetaS = 0.61, alpha = 0.1232, n = 1.3380,h=h)
 plot(x=h,y=y, log="x", xlab="h (hPa)", ylab=expression(delta*theta/delta*h), ylim=c(0,0.01))
+
 # EXAMPLE 3
 x <- seq(log10(1),log10(15000),len=100)
 h <- 10^x
@@ -42,5 +52,6 @@ ax <- c(1,10,100,1000,10000)
 radius <- r(h=ax)
 axis(3,at=ax, labels=round(radius,2))
 mtext("Equivalent pore radius"~(mu*m),3,line=2.5, cex=0.9)
+
 # End (not run)
 }