diff --git a/doc/user-manual/fpakc_UserManual.pdf b/doc/user-manual/fpakc_UserManual.pdf
index b831bba..3deffbb 100644
Binary files a/doc/user-manual/fpakc_UserManual.pdf and b/doc/user-manual/fpakc_UserManual.pdf differ
diff --git a/doc/user-manual/fpakc_UserManual.tex b/doc/user-manual/fpakc_UserManual.tex
index ae5455f..adaf454 100644
--- a/doc/user-manual/fpakc_UserManual.tex
+++ b/doc/user-manual/fpakc_UserManual.tex
@@ -547,13 +547,14 @@ make
                                 \begin{itemize}
                                   \item \textbf{A}: Ampere.
                                   \item \textbf{sccm}: Standard cubic centimeter.
+                                  \item \textbf{part/s}: Particles (real) per second.
                                 \end{itemize}
           \item \textbf{v}: Real.
                             Module of velocity vector, in $\unitfrac{m}{s}$.
           \item \textbf{n}: Real.
                             Array dimension $3$.
                             Direction of injection.
-                            Norm of vector must be equal $1$.
+                            This vector is normalized to $1$.
           \item \textbf{velDist}: Character.
                                   Array dimension $3$.
                                   Type of distribution function used to obtain injected particle velocity:
diff --git a/src/modules/moduleInject.f90 b/src/modules/moduleInject.f90
index 4ce168c..8c8f65d 100644
--- a/src/modules/moduleInject.f90
+++ b/src/modules/moduleInject.f90
@@ -89,9 +89,9 @@ MODULE moduleInject
       INTEGER:: nVolColl
 
       self%id         =  i
-      self%vMod       =  v/v_ref
-      self%n          =  n
-      self%T          =  T/T_ref
+      self%vMod       =  v / v_ref
+      self%n          =  n / NORM2(n)
+      self%T          =  T / T_ref
       self%species    => species(sp)%obj
       SELECT CASE(units)
       CASE ("sccm")