diff --git a/src/modules/geoip2/README b/src/modules/geoip2/README
index 80691c55168..a8ebc98adfb 100644
--- a/src/modules/geoip2/README
+++ b/src/modules/geoip2/README
@@ -30,6 +30,7 @@ Henning Westerholt
         3. Parameters
 
               3.1. path (string)
+              3.2. resid (str)
 
         4. Functions
 
@@ -44,8 +45,9 @@ Henning Westerholt
    List of Examples
 
    1.1. Set path parameter
-   1.2. geoip2_match usage
-   1.3. geoip2.reload usage
+   1.2. Set resid parameter
+   1.3. geoip2_match usage
+   1.4. geoip2.reload usage
 
 Chapter 1. Admin Guide
 
@@ -60,6 +62,7 @@ Chapter 1. Admin Guide
    3. Parameters
 
         3.1. path (string)
+        3.2. resid (str)
 
    4. Functions
 
@@ -115,6 +118,7 @@ Chapter 1. Admin Guide
 3. Parameters
 
    3.1. path (string)
+   3.2. resid (str)
 
 3.1. path (string)
 
@@ -127,6 +131,23 @@ Chapter 1. Admin Guide
 modparam("geoip2", "path", "/usr/local/share/GeoIP/GeoLite2-City.mmdb")
 ...
 
+3.2. resid (str)
+
+   Preregister result container id during initialization, enabling the use
+   of the module in KEMI scripts. In native Kamailio.cfg file,
+   registration is done when parsing config and finding variables.
+
+   Default value is “” (empty).
+
+   Example 1.2. Set resid parameter
+...
+modparam("geoip2", "resid", "src")
+...
+if(geoip2_match("$si", "src")) {
+   ...
+}
+...
+
 4. Functions
 
    4.1. geoip2_match(ipaddr, pvc)
@@ -135,8 +156,10 @@ modparam("geoip2", "path", "/usr/local/share/GeoIP/GeoLite2-City.mmdb")
 
    Match ipaddr against the GeoIP database and set the pvc container. The
    function has to be called before accessing a key via: $gip2(pvc=>key).
+   At least one function needs to be present that access the pvc
+   container, otherwise this function will not work.
 
-   Example 1.2. geoip2_match usage
+   Example 1.3. geoip2_match usage
 ...
 if(geoip2_match("$si", "src"))
     xlog("SIP message from: $gip2(src=>cc)\n");
@@ -151,7 +174,7 @@ if(geoip2_match("$si", "src"))
    Reload the internal GeoIP database. This is necessary after the
    database file has been changed on the disk.
 
-   Example 1.3. geoip2.reload usage
+   Example 1.4. geoip2.reload usage
 ...
 kamcmd geoip2.reload
 ...