diff --git a/Documentations/1-parser/Basics.md b/Documentations/1-parser/Basics.md
index 70d55f94c4decc44528e88e2d0cf284bcd5998a5..0e201319f3edde11725c975ad8886450ed6bf63b 100644
--- a/Documentations/1-parser/Basics.md
+++ b/Documentations/1-parser/Basics.md
@@ -81,11 +81,11 @@
 1. $`\text{program} \rightarrow \text{declaration-list}`$
 2. $`\text{declaration-list} \rightarrow \text{declaration-list}\ \text{declaration}\ |\ \text{declaration}`$
 3. $`\text{declaration} \rightarrow \text{var-declaration}\ |\ \text{fun-declaration}`$
-4. $`\text{var-declaration}\ \rightarrow \text{type-specifier}\ \underline{\textbf{ID}}\ \textbf{;}\ |\ \text{type-specifier}\ \underline{\textbf{ID}}\ \underline{\textbf{[}}\ \underline{\textbf{INTEGER}}\ \underline{\textbf{]}}\ \textbf{;}`$
+4. $`\text{var-declaration}\ \rightarrow \text{type-specifier}\ \underline{\textbf{ID}}\ \underline{\textbf{;}}\ |\ \text{type-specifier}\ \underline{\textbf{ID}}\ \underline{\textbf{[}}\ \underline{\textbf{INTEGER}}\ \underline{\textbf{]}}\ \underline{\textbf{;}}`$
 5. $`\text{type-specifier} \rightarrow \underline{\textbf{int}}\ |\ \underline{\textbf{float}}\ |\ \underline{\textbf{void}}`$
 6. $`\text{fun-declaration} \rightarrow \text{type-specifier}\ \underline{\textbf{ID}}\ \underline{\textbf{(}}\ \text{params}\ \underline{\textbf{)}}\ \text{compound-stmt}`$
 7. $`\text{params} \rightarrow \text{param-list}\ |\ \underline{\textbf{void}}`$
-8. $`\text{param-list} \rightarrow \text{param-list}\ ,\ \text{param}\ |\ \text{param}`$
+8. $`\text{param-list} \rightarrow \text{param-list}\ \underline{\textbf{,}}\ \text{param}\ |\ \text{param}`$
 9. $`\text{param} \rightarrow \text{type-specifier}\ \underline{\textbf{ID}}\ |\ \text{type-specifier}\ \underline{\textbf{ID}}\ \underline{\textbf{[}}\ \underline{\textbf{]}}`$
 10. $`\text{compound-stmt} \rightarrow \underline{\textbf{\{}}\ \text{local-declarations}\ \text{statement-list} \underline{\textbf{\}}}`$
 11. $`\text{local-declarations} \rightarrow \text{local-declarations var-declaration}\ |\ \text{empty}`$
@@ -95,7 +95,7 @@
 15. $`\begin{aligned}\text{selection-stmt} \rightarrow\ &\underline{\textbf{if}}\ \underline{\textbf{(}}\ \text{expression}\ \underline{\textbf{)}}\ \text{statement}\\ &|\ \underline{\textbf{if}}\ \underline{\textbf{(}}\ \text{expression}\ \underline{\textbf{)}}\ \text{statement}\ \underline{\textbf{else}}\ \text{statement}\end{aligned}`$
 16. $`\text{iteration-stmt} \rightarrow \underline{\textbf{while}}\ \underline{\textbf{(}}\ \text{expression}\ \underline{\textbf{)}}\ \text{statement}`$
 17. $`\text{return-stmt} \rightarrow \underline{\textbf{return}}\ \underline{\textbf{;}}\ |\ \underline{\textbf{return}}\ \text{expression}\ \underline{\textbf{;}}`$
-18. $`\text{expression} \rightarrow \text{var}\ \textbf{=}\ \text{expression}\ |\ \text{simple-expression}`$
+18. $`\text{expression} \rightarrow \text{var}\ \underline{\textbf{=}}\ \text{expression}\ |\ \text{simple-expression}`$
 19. $`\text{var} \rightarrow \underline{\textbf{ID}}\ |\ \underline{\textbf{ID}}\ \underline{\textbf{[}}\ \text{expression} \underline{\textbf{]}}`$
 20. $`\text{simple-expression} \rightarrow \text{additive-expression}\ \text{relop}\ \text{additive-expression}\ |\ \text{additive-expression}`$
 21. $`\text{relop}\ \rightarrow \underline{\textbf{<=}}\ |\ \underline{\textbf{<}}\ |\ \underline{\textbf{>}}\ |\ \underline{\textbf{>=}}\ |\ \underline{\textbf{==}}\ |\ \underline{\textbf{!=}}`$