diff --git a/CHANGELOG.md b/CHANGELOG.md
index 650d019..a020269 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -296,4 +296,5 @@ Sturm-Habicht sequence of a spray.
 
 * Functions `numberOfRealRoots`, `numberOfRealRootsInOpenInterval` and 
 `numberOfRealRootsInClosedInterval`, to compute the total number of real 
-roots of a suitable spray or its number of real roots in a given interval.
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+roots of a suitable univariate spray or its number of real roots in a given 
+interval. This can be very slow if the degree of the spray is not small.
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diff --git a/README.md b/README.md
index ca7ce92..bc11bce 100644
--- a/README.md
+++ b/README.md
@@ -552,5 +552,6 @@ been replaced with the `ParametricSpray` sprays.
 ## Other features
 
 Other features offered by the package include: resultant and subresultants of 
-two polynomials, and greatest common divisor of two polynomials with 
+two polynomials, Sturm-Habicht sequence of a polynomial, number of real roots 
+of a univariate polynomial, and greatest common divisor of two polynomials with 
 coefficients in a field.
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