diff --git a/filter-parser/src/error.rs b/filter-parser/src/error.rs
index d5d36bd8e..e28685c7a 100644
--- a/filter-parser/src/error.rs
+++ b/filter-parser/src/error.rs
@@ -141,10 +141,10 @@ impl<'a> Display for Error<'a> {
                 writeln!(f, "Expression `{}` is missing the following closing delimiter: `{}`.", escaped_input, c)?
             }
             ErrorKind::InvalidPrimary if input.trim().is_empty() => {
-                writeln!(f, "Was expecting an operation `=`, `!=`, `>=`, `>`, `<=`, `<`, `TO`, `EXISTS`, `NOT EXISTS`, or `_geoRadius` but instead got nothing.")?
+                writeln!(f, "Was expecting an operation `=`, `!=`, `>=`, `>`, `<=`, `<`, `IN`, `NOT IN`, `TO`, `EXISTS`, `NOT EXISTS`, or `_geoRadius` but instead got nothing.")?
             }
             ErrorKind::InvalidPrimary => {
-                writeln!(f, "Was expecting an operation `=`, `!=`, `>=`, `>`, `<=`, `<`, `TO`, `EXISTS`, `NOT EXISTS`, or `_geoRadius` at `{}`.", escaped_input)?
+                writeln!(f, "Was expecting an operation `=`, `!=`, `>=`, `>`, `<=`, `<`, `IN`, `NOT IN`, `TO`, `EXISTS`, `NOT EXISTS`, or `_geoRadius` at `{}`.", escaped_input)?
             }
             ErrorKind::ExpectedEof => {
                 writeln!(f, "Found unexpected characters at the end of the filter: `{}`. You probably forgot an `OR` or an `AND` rule.", escaped_input)?