diff --git a/src/core/ngx_crc32.c b/src/core/ngx_crc32.c
index f5f5e7e9c..12157021c 100644
--- a/src/core/ngx_crc32.c
+++ b/src/core/ngx_crc32.c
@@ -9,7 +9,7 @@
 
 
 /*
- * The code and lookup table is based on the algorithm
+ * The code and lookup table are based on the algorithm
  * described at http://www.w3.org/TR/PNG/
  */