diff --git a/include/telephony/ril.h b/include/telephony/ril.h
index df0e467..0512f52 100644
--- a/include/telephony/ril.h
+++ b/include/telephony/ril.h
@@ -1369,8 +1369,8 @@
     int mnc;    /* 2 or 3-digit Mobile Network Code, 0..999, INT_MAX if unknown */
     int lac;    /* 16-bit Location Area Code, 0..65535, INT_MAX if unknown  */
     int cid;    /* 16-bit GSM Cell Identity described in TS 27.007, 0..65535, INT_MAX if unknown  */
-    int arfcn;  /* 16-bit GSM Absolute RF channel number, INT_MAX if unknown */
-    uint8_t bsic;/* 6-bit Base Station Identity Code, 0xFF if unknown */
+    int arfcn;  /* 16-bit GSM Absolute RF channel number; this value must be reported */
+    uint8_t bsic; /* 6-bit Base Station Identity Code; 0xFF if unknown */
 } RIL_CellIdentityGsm_v12;
 
 typedef struct {
@@ -1386,8 +1386,8 @@
     int mnc;    /* 2 or 3-digit Mobile Network Code, 0..999, INT_MAX if unknown  */
     int lac;    /* 16-bit Location Area Code, 0..65535, INT_MAX if unknown  */
     int cid;    /* 28-bit UMTS Cell Identity described in TS 25.331, 0..268435455, INT_MAX if unknown  */
-    int psc;    /* 9-bit UMTS Primary Scrambling Code described in TS 25.331, 0..511, INT_MAX if unknown */
-    int uarfcn; /* 16-bit UMTS Absolute RF Channel Number, INT_MAX if unknown */
+    int psc;    /* 9-bit UMTS Primary Scrambling Code described in TS 25.331, 0..511; this value must be reported */
+    int uarfcn; /* 16-bit UMTS Absolute RF Channel Number; this value must be reported */
 } RIL_CellIdentityWcdma_v12;
 
 typedef struct {
@@ -1417,9 +1417,9 @@
     int mcc;    /* 3-digit Mobile Country Code, 0..999, INT_MAX if unknown  */
     int mnc;    /* 2 or 3-digit Mobile Network Code, 0..999, INT_MAX if unknown  */
     int ci;     /* 28-bit Cell Identity described in TS ???, INT_MAX if unknown */
-    int pci;    /* physical cell id 0..503, INT_MAX if unknown  */
+    int pci;    /* physical cell id 0..503; this value must be reported */
     int tac;    /* 16-bit tracking area code, INT_MAX if unknown  */
-    int earfcn; /* 18-bit LTE Absolute RC Channel Number, INT_MAX if unknown */
+    int earfcn; /* 18-bit LTE Absolute RF Channel Number; this value must be reported */
 } RIL_CellIdentityLte_v12;
 
 typedef struct {