--- a/src/Utils.h	Mon Jan 09 17:03:19 2023 +0100
+++ b/src/Utils.h	Tue Jan 10 16:56:21 2023 +0100
@@ -29,6 +29,14 @@
     double estimate_sg(double sugars, double batch_size);
 
     /**
+     * @brief Return log with custom base.
+     * @param y The input value.
+     * @param b The base to use.
+     * @return The log result.
+     */
+    double logbase(double y, int b);
+
+    /**
      * @brief Predict FG using recipe data.
      * @param psugar Percentage sugar in the wort.
      * @param pcara Percentage cara/crystal malts in the wort.