diff --git a/doc/configuration.txt b/doc/configuration.txt
index 6856463f3..b30b52f51 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -2520,16 +2520,17 @@ tune.sndbuf.server <number>
 
 tune.ssl.cachesize <number>
   Sets the size of the global SSL session cache, in a number of blocks. A block
-  is large enough to contain an encoded session without peer certificate.
-  An encoded session with peer certificate is stored in multiple blocks
-  depending on the size of the peer certificate. A block uses approximately
-  200 bytes of memory. The default value may be forced at build time, otherwise
-  defaults to 20000. When the cache is full, the most idle entries are purged
-  and reassigned. Higher values reduce the occurrence of such a purge, hence
-  the number of CPU-intensive SSL handshakes by ensuring that all users keep
-  their session as long as possible. All entries are pre-allocated upon startup
-  and are shared between all processes if "nbproc" is greater than 1. Setting
-  this value to 0 disables the SSL session cache.
+  is large enough to contain an encoded session without peer certificate.  An
+  encoded session with peer certificate is stored in multiple blocks depending
+  on the size of the peer certificate. A block uses approximately 200 bytes of
+  memory (based on `sizeof(struct sh_ssl_sess_hdr) + SHSESS_BLOCK_MIN_SIZE`
+  calculation used for `shctx_init` function). The default value may be forced
+  at build time, otherwise defaults to 20000. When the cache is full, the most
+  idle entries are purged and reassigned. Higher values reduce the occurrence
+  of such a purge, hence the number of CPU-intensive SSL handshakes by ensuring
+  that all users keep their session as long as possible. All entries are
+  pre-allocated upon startup and are shared between all processes if "nbproc"
+  is greater than 1. Setting this value to 0 disables the SSL session cache.
 
 tune.ssl.force-private-cache
   This option disables SSL session cache sharing between all processes. It