diff --git a/builds/install/misc/firebird.conf b/builds/install/misc/firebird.conf
index 0d361a0b9a..89c548187d 100644
--- a/builds/install/misc/firebird.conf
+++ b/builds/install/misc/firebird.conf
@@ -871,7 +871,9 @@
 # Bytes of shared memory allocated for snapshots management.
 # This will grow automatically unless you use an exotic platform
 # that is neither Windows nor supports mmap system call.
-# Each active shapshot uses 16 bytes of memory.
+# Each active snapshot uses 16 bytes of memory.
+# The size is an allocation unit. The snapshot table expands dynamically in
+# increments of this allocation unit, up to the limit of memory.
 #
 # Per-database configurable.
 #