diff --git a/make-includes/build_document_rules.make b/make-includes/build_document_rules.make
index e6eb5b6..447c2a0 100755
--- a/make-includes/build_document_rules.make
+++ b/make-includes/build_document_rules.make
@@ -391,7 +391,7 @@
 ################################################################################
 #
 # Deploy the appropriate files into a shared folder, which is then synchronised
-# with Blackbaord. This relies on the environment variable HANDBOOK_INSTALL_ROOT
+# with Blackboard. This relies on the environment variable HANDBOOK_INSTALL_ROOT
 # being defined, and (assuming that this variable points to a directory on the
 # network) the appropriate share has been mounted.
 #