diff --git a/src/include/pg_config.h.win32 b/src/include/pg_config.h.win32
index ad6e947d3e1..41d9fca0ad6 100644
--- a/src/include/pg_config.h.win32
+++ b/src/include/pg_config.h.win32
@@ -639,7 +639,7 @@
 /* Use replacement snprintf() functions. */
 #define USE_REPL_SNPRINTF 1
 
-/* Define to 1 to use Intel SSE 4.2 CRC instructions with a runtime check. */
+/* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #if (_MSC_VER < 1500)
 #define USE_SLICING_BY_8_CRC32C 1
 #endif
@@ -647,7 +647,7 @@
 /* Define to 1 use Intel SSE 4.2 CRC instructions. */
 /* #undef USE_SSE42_CRC32C */
 
-/* Define to 1 to use Intel SSSE 4.2 CRC instructions with a runtime check. */
+/* Define to 1 to use Intel SSE 4.2 CRC instructions with a runtime check. */
 #if (_MSC_VER >= 1500)
 #define USE_SSE42_CRC32C_WITH_RUNTIME_CHECK
 #endif