diff --git a/asciidoc-reference-cheat-sheet.adoc b/asciidoc-reference-cheat-sheet.adoc
index 62b1aa1..001a726 100644
--- a/asciidoc-reference-cheat-sheet.adoc
+++ b/asciidoc-reference-cheat-sheet.adoc
@@ -14,8 +14,8 @@ Author: Yuri Slobodyanyuk, admin@yurisk.info
 |Types of AsciiDoc documents
 
 |Block types
-a| Document \:\:= (Header?, Preamble?, Section*) +
-   Header \:\:= (Title, (AuthorInfo, RevisionInfo?)?) +
+a| Document ::= (Header?, Preamble?, Section*) +
+   Header ::= (Title, (AuthorInfo, RevisionInfo?)?) +
 
 
 
diff --git a/asciidoc-reference-cheat-sheet.pdf b/asciidoc-reference-cheat-sheet.pdf
index 1c77e4f..90958b6 100644
Binary files a/asciidoc-reference-cheat-sheet.pdf and b/asciidoc-reference-cheat-sheet.pdf differ