diff --git a/sdk/storage/azure-storage-common/src/shared_key_policy.cpp b/sdk/storage/azure-storage-common/src/shared_key_policy.cpp
index 595b312cf..7f3fbf785 100644
--- a/sdk/storage/azure-storage-common/src/shared_key_policy.cpp
+++ b/sdk/storage/azure-storage-common/src/shared_key_policy.cpp
@@ -11,6 +11,10 @@
 #include <algorithm>
 
 namespace {
+/*
+ * We need to imitate .Net culture-aware sorting, which is used in storage service.
+ * Below tables contain sort-keys for en-US culture.
+ */
 const static int table_lv0[128] = {
     0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,
     0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,   0x0,