diff --git a/doc/go1.12.html b/doc/go1.12.html
index 291c19ace2..4c2765021f 100644
--- a/doc/go1.12.html
+++ b/doc/go1.12.html
@@ -138,6 +138,17 @@ Go 1.13 will require macOS 10.11 El Capitan or later.
   that build fails.
 </p>
 
+<p><!-- CL 152739 -->
+  When an import cannot be resolved using the active modules,
+  the <code>go</code> command will now try to use the modules mentioned in the
+  main module's <code>replace</code> directives before consulting the module
+  cache and the usual network sources.
+  If a matching replacement is found but the <code>replace</code> directive does
+  not specify a version, the <code>go</code> command uses a pseudo-version
+  derived from the zero <code>time.Time</code> (such
+  as <code>v0.0.0-00010101000000-000000000000</code>).
+</p>
+
 <h3 id="compiler">Compiler toolchain</h3>
 
 <p><!-- CL 134155, 134156 -->