diff --git a/Algebraic_kernel_d/doc_tex/Algebraic_kernel_d/intro.tex b/Algebraic_kernel_d/doc_tex/Algebraic_kernel_d/intro.tex
index 94e31f0653c..2abaa9c5627 100644
--- a/Algebraic_kernel_d/doc_tex/Algebraic_kernel_d/intro.tex
+++ b/Algebraic_kernel_d/doc_tex/Algebraic_kernel_d/intro.tex
@@ -4,7 +4,7 @@
 Real solving of polynomials is a fundamental problem with a wide application range. 
 This package is targeted to provide black-box implementations of state-of-the-art 
 algorithms to determine, compare and approximate real roots of univariate and 
-bivariate polynomials. Such a back-box implementation is called an {\bf Algebraic Kernel}. Since  
+bivariate polynomials. Such a black-box implementation is called an {\bf Algebraic Kernel}. Since  
 this package provides more than one implementation, the interface of the algebraic kernels 
 is expressed in concepts. The main concepts provided by this package are the 
 \ccc{AlgebraicKernel_d_1} for univariate polynomials and \ccc{AlgebraicKernel_d_2}