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diff --git a/doc/sphinx/arm/hooks-ping-check.rst b/doc/sphinx/arm/hooks-ping-check.rst
index 0e0a1b2d7565d008c001c3f3506922f76748041a..9aea07e44583fa2eb90c8f1fbee3b63c71346c4e 100644 (file)
--- a/doc/sphinx/arm/hooks-ping-check.rst
+++ b/doc/sphinx/arm/hooks-ping-check.rst
@@ -10,7 +10,7 @@ checks of candiate addresses prior to offering them in leases to clients.
 
 .. note::
 
-    libdhcp_ping_check.so will be available only to ISC customers with a paid support
+    :ischooklib:`libdhcp_ping_check.so` will be available only to ISC customers with a paid support
     contract. For more information on subscription options, please complete the form
     at https://www.isc.org/contact.