diff --git a/src/core/lib/support/string.h b/src/core/lib/support/string.h
index 3aebc083ac1..9a94e9471cf 100644
--- a/src/core/lib/support/string.h
+++ b/src/core/lib/support/string.h
@@ -118,6 +118,8 @@ void gpr_strvec_add(gpr_strvec *strs, char *add);
    total_length as per gpr_strjoin */
 char *gpr_strvec_flatten(gpr_strvec *strs, size_t *total_length);
 
+/** Case insensitive string comparison... return <0 if lower(a)<lower(b), ==0 if
+    lower(a)==lower(b), >0 if lower(a)>lower(b) */
 int gpr_stricmp(const char *a, const char *b);
 
 #ifdef __cplusplus