diff --git a/Release-notes.md b/Release-notes.md
index b4ada2f..472a320 100644
--- a/Release-notes.md
+++ b/Release-notes.md
@@ -33,7 +33,7 @@
 - Some OBITools (now `obigrep` and `obiconvert`) are capable of using paired read files. 
   Options have been added for this (**--paired-with** _FILENAME_, and **--paired-mode** _forward|reverse|and|andnot|xor_). This, in combination with the **--out** option shown above, ensures that the two matched files remain consistent when processed. 
 
-## February $18^th$, 2023. Release 4.0.0
+## February 18th, 2023. Release 4.0.0
 
 It is the first version of the *OBITools* version 4. I decided to tag then following two weeks
 of intensive data analysis with them allowing to discover many small bugs present in the previous
@@ -59,4 +59,4 @@ to use the git ticket system to mention them. But they seems to produce now reli
 - Adding of a `--directory|-d` option to the `obidistribute` tool. It allows to declare a secondary 
   classification key over the one defined by the '--category|-c` option. This extra key leads to produce
   directories in which files produced according to the primary criterion are stored.
-- Adding of the functions `subspc`, `printf`, `int`, `numeric`, and `bool` to the expression language. 
\ No newline at end of file
+- Adding of the functions `subspc`, `printf`, `int`, `numeric`, and `bool` to the expression language.