Fix broken Javadoc
diff --git a/src/main/java/org/apache/commons/codec/binary/Base64.java b/src/main/java/org/apache/commons/codec/binary/Base64.java
index f515b51..aed7843 100644
--- a/src/main/java/org/apache/commons/codec/binary/Base64.java
+++ b/src/main/java/org/apache/commons/codec/binary/Base64.java
@@ -788,7 +788,7 @@
* Validates whether the character is possible in the context of the set of possible base 64 values.
* </p>
*
- * @param numBits number of least significant bits to check
+ * @param numBitsToDrop number of least significant bits to check
* @param context the context to be used
*
* @throws IllegalArgumentException if the bits being checked contain any non-zero value
