diff --git a/src/vector.c b/src/vector.c
index 562373d..1e3f688 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -1149,7 +1149,7 @@ CheckByteLengths(unsigned long aLen, unsigned long bLen)
 }
 
 /*
- * Get the hamming distance between two binary strings
+ * Get the Hamming distance between two binary strings
  */
 PGDLLEXPORT PG_FUNCTION_INFO_V1(hamming_distance);
 Datum