diff --git a/INSTALL-MAC b/INSTALL-MAC
index bd63f1a28..454b3db5d 100644
--- a/INSTALL-MAC
+++ b/INSTALL-MAC
@@ -3,9 +3,10 @@ Manager to install dependencies, including Qt and GSL, on Travis-ci
 macOS Mojave build environment.
 You can check the travis/osx folder for the complete and updated build scripts,
 the minimum Qt version known to work is 5.13 with Qt WebEngine and Qt Charts.
-GSL - GNU Scientific Library is a mandatory dependency starting with v3.6
+GSL - GNU Scientific Library is a mandatory dependency starting with v3.6 and
+minimum bison version is 2.7, both can be installed using Homebrew.
 
-Ale Martinez - Jul, 2022
+Ale Martinez - Oct, 2022
 
                                  +++++++++++++++++++++++
                                 MAC OSX BUILD WALKTHROUGH
diff --git a/src/Core/DataFilter.y b/src/Core/DataFilter.y
index 30070f131..731b3e6c5 100644
--- a/src/Core/DataFilter.y
+++ b/src/Core/DataFilter.y
@@ -23,7 +23,7 @@
 // enable multiple grammars in a single executable you
 // should make sure you use the very latest bison since it
 // has been known to be problematic in the past. It is
-// know to work well with bison v2.4.1.
+// know to work well with bison v2.7.
 //
 // To make the grammar readable I have placed the code
 // for each nterm at column 40, this source file is best