diff --git a/OPTIONS b/OPTIONS
index 3499692d9b..bf36debecb 100644
--- a/OPTIONS
+++ b/OPTIONS
@@ -19,4 +19,7 @@ Setting                   Description
                           named-checkzone
 -DNS_RUN_PID_DIR=0        Create default PID files in ${localstatedir}/run
                           rather than ${localstatedir}/run/named/
+                          Increase the maximum number of configurable
+-DNS_RPZ_MAX_ZONES=64     response policy zones from 32 to 64; this is the
+                          highest possible setting
 
diff --git a/OPTIONS.md b/OPTIONS.md
index 258aab453a..fabf1adf9d 100644
--- a/OPTIONS.md
+++ b/OPTIONS.md
@@ -20,3 +20,4 @@ Some of these settings are:
 |`-DCHECK_SIBLING=0`|Don't check sibling glue in `named-checkzone`|
 |`-DCHECK_LOCAL=0`|Don't check out-of-zone addresses in `named-checkzone`|
 |`-DNS_RUN_PID_DIR=0`|Create default PID files in `${localstatedir}/run` rather than `${localstatedir}/run/named/`|
+|`-DNS_RPZ_MAX_ZONES=64`|Increase the maximum number of configurable response policy zones from 32 to 64; this is the highest possible setting|