diff --git a/_includes/cheatsheet-text-plaintext.md b/_includes/cheatsheet-text-plaintext.md
index 93493ad..813d483 100644
--- a/_includes/cheatsheet-text-plaintext.md
+++ b/_includes/cheatsheet-text-plaintext.md
@@ -26,7 +26,8 @@ SignedInteger :=  int
 
 Embedded      :=  `#!` Value
 Annotated     :=  Annotation Value
-Annotation    :=  `@` Value | `;` «any unicode scalar except cr or lf»* (cr | lf)
+Annotation    :=  `@` Value | `#` ((space | tab) linecomment) (cr | lf)
+linecomment   :=  «any unicode scalar except cr or lf»*
 
 escaped       :=  `\\` | `\/` | `\b` | `\f` | `\n` | `\r` | `\t` | `\u` hex hex hex hex
 binescaped    :=  `\\` | `\/` | `\b` | `\f` | `\n` | `\r` | `\t` | `\x` hex hex
diff --git a/_includes/cheatsheet-text.md b/_includes/cheatsheet-text.md
index d995ab5..a2aeb8b 100644
--- a/_includes/cheatsheet-text.md
+++ b/_includes/cheatsheet-text.md
@@ -26,7 +26,8 @@
 {:.postcard-grammar.textsyntax}
 | *Embedded* | := | `#!`*Value* |
 | *Annotated* | := | *Annotation* *Value* |
-| *Annotation* | := | `@`*Value* &#124;`;`« any unicode scalar value except **cr** or **lf** »<sup>⋆</sup> (**cr** &#124; **lf**) |
+| *Annotation* | := | `@`*Value* &#124;`#` ((**space** &#124; **tab**) *linecomment*) (**cr** &#124; **lf**) |
+| *linecomment* | := | « any unicode scalar value except **cr** or **lf** »<sup>⋆</sup> |
 
 {:.postcard-grammar.textsyntax}
 | *escaped* | := | `\\`&#124;`\/`&#124;`\b`&#124;`\f`&#124;`\n`&#124;`\r`&#124;`\t`&#124;`\u`*hex* *hex* *hex* *hex* |
diff --git a/implementations/rust/preserves/doc/cheatsheet-text-plaintext.md b/implementations/rust/preserves/doc/cheatsheet-text-plaintext.md
index 93493ad..813d483 100644
--- a/implementations/rust/preserves/doc/cheatsheet-text-plaintext.md
+++ b/implementations/rust/preserves/doc/cheatsheet-text-plaintext.md
@@ -26,7 +26,8 @@ SignedInteger :=  int
 
 Embedded      :=  `#!` Value
 Annotated     :=  Annotation Value
-Annotation    :=  `@` Value | `;` «any unicode scalar except cr or lf»* (cr | lf)
+Annotation    :=  `@` Value | `#` ((space | tab) linecomment) (cr | lf)
+linecomment   :=  «any unicode scalar except cr or lf»*
 
 escaped       :=  `\\` | `\/` | `\b` | `\f` | `\n` | `\r` | `\t` | `\u` hex hex hex hex
 binescaped    :=  `\\` | `\/` | `\b` | `\f` | `\n` | `\r` | `\t` | `\x` hex hex