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diff --git a/pullimap.md b/pullimap.md
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@@ -210,12 +210,19 @@ Valid options are:
*SSL_fingerprint*
-: Fingerprint of the server certificate (or its public key) in the
- form `[ALGO$]DIGEST_HEX`, where `ALGO` is the used algorithm
- (by default `sha256`).
+: Fingerprint of the server certificate's Subject Public Key Info, in
+ the form `[ALGO$]DIGEST_HEX` where `ALGO` is the used algorithm (by
+ default `sha256`).
Attempting to connect to a server with a non-matching certificate
- fingerprint causes `pullimap` to abort the connection during the
- SSL/TLS handshake.
+ SPKI fingerprint causes `pullimap` to abort the connection during
+ the SSL/TLS handshake.
+
+ You can use the following command to compute the SHA-256 digest of
+ certificate's Subject Public Key Info.
+
+ openssl x509 -in /path/to/server/certificate.pem -pubkey \
+ | openssl pkey -pubin -outform DER \
+ | openssl dgst -sha256
*SSL_verify*