Correct javadoc for Dfp log function
diff --git a/commons-math-legacy-core/src/main/java/org/apache/commons/math4/legacy/core/dfp/DfpMath.java b/commons-math-legacy-core/src/main/java/org/apache/commons/math4/legacy/core/dfp/DfpMath.java
index f224964..d3820a0 100644
--- a/commons-math-legacy-core/src/main/java/org/apache/commons/math4/legacy/core/dfp/DfpMath.java
+++ b/commons-math-legacy-core/src/main/java/org/apache/commons/math4/legacy/core/dfp/DfpMath.java
@@ -304,7 +304,7 @@
 
     /** Returns the natural logarithm of a.
      * a is first split into three parts such that {@code a = (10000^h)(2^j)k}.
-     * ln(a) is computed by {@code ln(a) = ln(5)*h + ln(2)*(h+j) + ln(k)}.
+     * ln(a) is computed by {@code ln(a) = ln(5)*4h + ln(2)*(4h+j) + ln(k)}.
      * k is in the range {@code 2/3 < k <4/3} and is passed on to a series expansion.
      * @param a number from which logarithm is requested
      * @return log(a)