diff --git a/modules/topoh/README b/modules/topoh/README
index 213524545c9..fb7442cc561 100644
--- a/modules/topoh/README
+++ b/modules/topoh/README
@@ -34,6 +34,7 @@ Daniel-Constantin Mierla
               3.7. vparam_prefix (str)
               3.8. callid_prefix (str)
               3.9. sanity_checks (integer)
+              3.10. uri_prefix_checks (integer)
 
    List of Examples
 
@@ -46,6 +47,7 @@ Daniel-Constantin Mierla
    1.7. Set vparam_prefix parameter
    1.8. Set callid_prefix parameter
    1.9. Set sanity_checks parameter
+   1.10. Set uri_prefix_checks parameter
 
 Chapter 1. Admin Guide
 
@@ -68,6 +70,7 @@ Chapter 1. Admin Guide
         3.7. vparam_prefix (str)
         3.8. callid_prefix (str)
         3.9. sanity_checks (integer)
+        3.10. uri_prefix_checks (integer)
 
 1. Overview
 
@@ -113,6 +116,7 @@ Chapter 1. Admin Guide
    3.7. vparam_prefix (str)
    3.8. callid_prefix (str)
    3.9. sanity_checks (integer)
+   3.10. uri_prefix_checks (integer)
 
 3.1. mask_key (str)
 
@@ -226,3 +230,22 @@ modparam("topoh", "callid_prefix", "***")
 ...
 modparam("topoh", "sanity_checks", 1)
 ...
+
+3.10. uri_prefix_checks (integer)
+
+   If set to 1, topoh module will check if URIs to be decoded match the
+   expected prefix composed from mask IP and parameter name prefix. It can
+   make the topoh processing safer by avoiding to try decoding URIs which
+   were not encoded previously by topoh.
+
+   Note: do not enable this option if you have SIP devices that can alter
+   the URI values it takes from Contact or Record-Route headers (like
+   adding port 5060 when no port is in received URIs, or thet introduce
+   new parameters at unknown position).
+
+   Default value is 0.
+
+   Example 1.10. Set uri_prefix_checks parameter
+...
+modparam("topoh", "uri_prefix_checks", 1)
+...