diff --git a/homepage/knowledge/netbsd/index.html b/homepage/knowledge/netbsd/index.html
index 13514f6..eb9e151 100644
--- a/homepage/knowledge/netbsd/index.html
+++ b/homepage/knowledge/netbsd/index.html
@@ -17,6 +17,11 @@
 <H1>NetBSD</H1>
 <H3>updated 2021-07-14</H3>
 <HR ALIGN="left" SIZE="1" WIDTH="25%" />
+<H2>Fix <CODE>SSL certificate problem: unable to get local issuer certificate</CODE></H2>
+<P>
+Install <CODE>security/mozilla-rootcerts-openssl</CODE>.
+(<A HREF="https://github.com/ohmyzsh/ohmyzsh/issues/8321#issuecomment-863493503">Source</A>.)
+</P>
 <H2>Mounting ext4 partitions with FUSE</H2>
 <P>
 I don't know that this is documented in either the NetBSD guide or wiki.